a) The cumulative distribution function for X is F(x) = 1 – exp(-x²)
is = 1 – exp(-x²)
b) P(X ≤ 2) = 0.865
c) Generate a uniformly distributed random number u between 0 and 1.
a) We have given a probability density function f(x) = 2x exp(-x²), x ≥ 0
To find the cumulative distribution function (CDF), we integrate the probability density function (PDF) from negative infinity to x as follows;
∫f(x)dx = ∫2x exp(-x²)dx
Using u =
-x², du/dx = -2x
dx = -du/2∫2x exp(-x²)dx
= -∫exp(u)du
= -exp(u) + C
= -exp(-x²) + C
We know that, F(x) = ∫f(x)dx.
From the above calculation, the CDF of X is given by;
F(x) = 1 – exp(-x²)
b)
We are to calculate P(X ≤ 2)
We know that F(2) = 1 – exp(-2²)
= 0.865
Therefore, P(X ≤ 2) = 0.865
c)
The inversion method is a way of generating random values of a random variable X using the inverse of the cumulative distribution function of X, denoted as F⁻¹(u),
where u is a uniformly distributed random number between 0 and 1.
The steps for generating a random value of X using the inversion method are:
Generate a uniformly distributed random number u between 0 and 1.
Find the inverse of the cumulative distribution function, F⁻¹(u).
This gives us the value of X.
d)
R command for one random value of X by using the inversion method```{r}
# setting seed to be 100 sets. seed(100)
# defining the inverse CDFF_inv = function(u) q norm(u, lower.tail=FALSE)
# generating a random value of Uu = run if(1)
# calculating the corresponding value of Xx = F_inv(u)```
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Find 8.76 - 10.91. Write your answer as a decimal.
Answer:
-2.15
Step-by-step explanation:
Plug it into the calculator and it should give you the same answer.
Answer:
The answer is -2.15.
Step-by-step explanation:
Hope this helped Mark BRAINLIEST!!!
Marissa bought 7 bottles of soda for a party. Each bottle was 2-liters. How many gallons of soda did she buy?
Answer
3.7 or approximately 4 gallons
Step-by-step explanation:
7x2=14 total liters.
3.78 liters=1 gallon
14/3.78= 3.7 gallons
Sort each expense as either a fixed expense or a variable expense.
monthly rent
ixed Expense
Variable Expense
car payment
movies
savings for new guitar
snacks
video games
Answer:
fixed - monthly rent, car payment, savings for new guitar
variable - movies, video games, snacks
Step-by-step explanation:
Fixed costs are costs that do not vary with output.
the amount of rent paid is fixed.
Variable costs are costs that vary with production
the amount paid at the movies depend on the number of movies watched
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Answer: 13
Step-by-step explanation: the square root is 12.68925
so i rounded up to 13
Answer:
12.6885775404 or 13 if you need to round up
Step-by-step explanation:
11. The ages (in years) of 11 children and the number of words in their vocabulary. Find the correlation coefficient r.
Age, x
1
2
3
4
5
6
3
5
2
4
6
Vocabulary size, y
3
220
540
1100
2100
2600
730
2200
260
1200
2500
describe the vertical asymptotes) and holes) for the graph of y=x-6/x^2 5x 6
Given the function `y = (x-6) / (x^2 + 5x + 6)`, let's identify the vertical asymptotes and holes: Factoring the denominator, we get`(x^2 + 5x + 6) = (x+2)(x+3)`So, `y = (x-6) / (x+2)(x+3)`
The vertical asymptotes of the function are the roots of the denominator. Thus, the vertical asymptotes of the function are `x = -2` and `x = -3`.Now, we'll look for the holes in the function. A hole is a point where the function is undefined but can be simplified by canceling common factors.
In the given function, we notice that the numerator `(x-6)` and the denominator `(x+2)(x+3)` have a common factor of `(x-6)`. Thus, there is a hole at `x = 6`.We can cancel `(x-6)` from both numerator and denominator to obtain the simplified function `y = 1 / (x+3)`.Therefore, the vertical asymptotes are `x = -2` and `x = -3`, and there is a hole at `x = 6`.
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Calculate the distance between point B (3,-7) and point C (0,8) on the coordinate grid
Answer:
Distance= 15.3
Step-by-step explanation:
(4, 4 3 ) (i) find polar coordinates (r, ) of the point, where r > 0 and 0 ≤ < 2. (r, ) = (ii) find polar coordinates (r, ) of the point, where r < 0 and 0 ≤ < 2.
(i) The polar coordinates (r, θ) of the point (4, 3) are (5, arctan(3/4)). (ii) For a point with negative radius, the concept of polar coordinates is not applicable as polar coordinates are defined for points in the positive radial direction.
(i) To find the polar coordinates (r, θ) of the point (4, 3), we can use the formulas:
r = √(x² + y²) and θ = arctan(y/x).
Given that x = 4 and y = 3, we can calculate the values:
r = √(4² + 3²) = 5
θ = arctan(3/4)
Therefore, the polar coordinates of the point (4, 3) are (5, arctan(3/4)).
(ii) For a point with negative radius, the concept of polar coordinates is not applicable. In polar coordinates, the radius (r) is always defined as a positive value. Negative values of r would imply a direction opposite to the positive radial direction. However, the convention of polar coordinates focuses on the positive radial direction, so negative radius values are not considered.
In conclusion, polar coordinates are not defined for points with negative radius values, and therefore, the concept of polar coordinates does not apply to find the polar coordinates of a point with r < 0.
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This question: 1 point possible Submit test of the Serples of DNA are collected, and the four DNA bases of A, G, C, and Tare coded as 1, 2, 3, and 4, respectively. The results are listed below. Construct a % confidence interval imate of the mean What i confidence interval) 2.2.1.3.4.3.4.3.31 What is the confidence interval for the population meon ? Round to one decimal place as needed) What is the practical use of the confidence interval? Select the correct choice below and necessary, it in the answer boxes to complete your choice OA The confidence interval can be used to estimate that, with 99% confidence, the interval from to actuality contains the true mean DNA base of all people (Round to one decimal place as needed) OB. The given numbers are just subetties for the four DNA base names, so the numbers do not measure or court anything, and they are at the nominal level of measurement. The confidence interval has no practical u OC The confidence interval can be used to estimate that 99% of all people have DNA bases between and (Round to one decimal place as needed.) Next MacBook Air & 7 Statcrunch W E 4 He R % 5 T 6 29 U .00 8 1 9 17
The confidence interval for the population mean would be 1.8 < u < 3.4.
The practical use of the confidence interval is this: A The confidence interval can be used to estimate that, with 99% confidence, the interval from to actuality contains the true mean DNA base of all people.
What is the confidence interval?The confidence interval expresses the probability that a given population parameter will be centered between a set of values. So, the practical use of the confidence interval is to indicate that if the experiment is repeated 100 times, 99 of those times will give a result that shows that the true mean of all people falls within the obtained values.
The confidence interval is obtained thus: μ ± Ζ s/√n
where μ = sample mean
Z = confidence level
s = standard deviation
n = sample size
From the question DNA samples or n = 10
Critical value = 2.262
Sample mean = 2.6
Standard deviation = 1.0749
The margin of error = 2.262 * 1.0749/√10
= 0.769
We can construct the 95% confidence level interval as follows:
x bar - E < u < x bar + E
= 2.6 - 0.7690 < u < 2.6 + 0.7690
= 1.8 < u < 3.4.
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2
(
3
r
+
4
)
−
3
(
r
+
1
)
=
11
Hey there!
ASSUMING
2(3r + 4) - 3 (r + 1) = 11
IF SO
2(3r + 4) - 3 (r + 1) = 11
2(3r + 4) - 3 (1r + 1) = 11
DISTRIBUTE
2(3r) + 2(4) - 3(1r) - 1(1) = 11
6r + 8 - 3r - 1 = 11
COMBINE the LIKE TERMS
(6r - 3r) + (8 - 3) = 11
6r - 3r + 8 - 3 = 11
3r + 5 = 11
SUBTRACT 5 to BOTH SIDES
3r + 5 - 5 = 11 - 5
SIMPLIFY!
3r = 11 - 5
3r = 6
DIVIDE 3 to BOTH SIDES
3r/3 = 6/3
SIMPLIFY!
r = 6/3
r = 2
Therefore, the answer should be: r = 2
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)
Ice rental: $150 Skate rental: $3
Write a problem that can be solved using an equation then solve the problem
Answer:
Ice rental at the local skating rink is $150 for 2h. Skate rental is $3 per person. The Grade 8 class went skating. All students rented skates. The total cost was $231. How many students went skating?
Given the set S = (Q n [13, 16]) U (1,5) U (5, 7) U20 + ()" u{zo-1-8"} n ηε N Answer the following questions. Mark all items that apply. 1. Which of these points are in the interior of S?
The interior of S consists of all the points in S that are not in the boundary of S. These points are:
The rational numbers strictly between 13 and 16
The rational numbers strictly between 1 and 5
The rational numbers strictly between 5 and 7
The natural numbers strictly between 1 and 18, excluding 20
The set S consists of the rational numbers between 13 and 16 (inclusive), the open interval between 1 and 5, the open interval between 5 and 7, the singleton set {20}, and the set of natural numbers between 0 and 18.
To find the interior of S, we need to find all the points in S that have a neighborhood entirely contained in S. In other words, we need to find all the points in S that are not on the boundary of S.
The boundary of S includes the endpoints of the closed interval [13, 16] and the endpoints of the open intervals (1, 5) and (5, 7), as well as the points 20, 0, and 18.
Therefore, the interior of S consists of all the points in S that are not in the boundary of S. These points are:
The rational numbers strictly between 13 and 16
The rational numbers strictly between 1 and 5
The rational numbers strictly between 5 and 7
The natural numbers strictly between 1 and 18, excluding 20
Note that the point 20 is not in the interior of S because it is on the boundary of S. Similarly, the points 0 and 18 are not in the interior of S because they are in the boundary of S.
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5.
A. never
B. not enough information provided
C. sometimes
D. always
Answer:
Step-by-step explanation:
The correct answer is Always
kason11wd and 2 more users found this answer helpful
THANKS
1
4.0
(1 vote)
1
the correct answer was never. I appreciate your answer though.
.............................................................................................................................................................
P(A and B) means add A and B
if both A and B are both greater then 1/2
then when they are added they will always be greater than 1
bolivianouft and 2 more users found this answer helpful
THANKS
1
5.0
(1 vote)
1
the correct answer was never. I appreciate your answer though.
Answer:The correct answer is Always
What is -a-2 if a = -5?
Answer:
3
Step-by-step explanation:
-(-5) -2
5 - 2
3
Answer:
-7
Step-by-step explanation:
-a - 2 = -5 + -2 (different sign- keep the first number same, change the sign to addition and the additive inverse of the second number) -5 + -2 = -7Hope this helps
Consider the function h(z) = 1 4iz + 2 defined on the extended complex plane. (a) Write h as a composition of the linear function g(z) and reciprocal function f(z) (b) Determine the image of the line y = 2 under w=h(z). (c) Determine the image of the circle |z - i| = 1/2 under w = h(z).
The function h(z) = 1 4iz + 2 defined on the extended complex plane,
(a) The function h(z) = 1/(4iz + 2) can be expressed as a composition of the linear function g(z) and reciprocal function f(z).
(b) The image of the line y = 2 under w = h(z) is the point z = -3/(8i).
(c) The image of the circle |z - i| = 1/2 under w = h(z) is the two points z = i + √7/2 and z = i - √7/2.
(a) To express the function h(z) = 1/(4iz + 2) as a composition of a linear function g(z) and reciprocal function f(z), we can rewrite h(z) as follows:
h(z) = 1/(4iz + 2)
= 1/(4i(g(z)) + 2)
= 1/f(g(z))
Here, g(z) represents the linear function and f(z) represents the reciprocal function. To determine g(z), we set g(z) = 4iz + 2.
Therefore, the composition of the linear function g(z) and the reciprocal function f(z) is:
h(z) = 1/f(g(z)) = 1/(4iz + 2)
(b) To find the image of the line y = 2 under w = h(z), we substitute y = 2 into the function h(z) and solve for z.
y = 2
1/(4iz + 2) = 2
To simplify the equation, we multiply both sides by (4iz + 2):
1 = 2(4iz + 2)
1 = 8iz + 4
8iz = -3
z = -3/(8i)
Therefore, the image of the line y = 2 under w = h(z) is the point z = -3/(8i).
(c) To determine the image of the circle |z - i| = 1/2 under w = h(z), we substitute z - i = 1/2 into the function h(z) and solve for w.
|z - i| = 1/2
|z - i|² = (1/2)²
(z - i)(z - i*) = 1/4
z² - iz - iz + i² = 1/4
z² - 2iz + 1 = 1/4
z² - 2iz + 3/4 = 0
Now we solve this quadratic equation using the quadratic formula:
z = (-(-2i) ± √((-2i)² - 4(1)(3/4))) / (2(1))
z = (2i ± √(-4i² - 3)) / 2
z = (2i ± √(4 + 3)) / 2
z = (2i ± √7) / 2
z = i ± √7/2
So, the image of the circle |z - i| = 1/2 under w = h(z) is the two points z = i + √7/2 and z = i - √7/2.
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the bar graph shows the approximate average rainfall for different cities in Texas compare the total inches of rainfall to the average annual rainfall in san Antonio ?
Answer:
I don't know
Step-by-step explanation:
I don't know
which expression is not equvialet to 28ax
2(19-7) im pretty sure
How do you expand (4x+2)2
Answer:
=8x+4
Step-by-step explanation:
=2(4x+2)
a=2,b=4x,c=2
=2 x 4x + 2 x 2
Simplify- 2 x 4x + 2 x 2: 8x + 4
Hi can you guys please answer this! I’ll mark you as brainless
Answer:
0.42846931021
Step-by-step explanation:
PLSSSSSS HELPPPPP PLS I NEED HELPPP PLSS
Let equal the price of one smoothie. Complete the equation.
(5 smoothies) (price of 1 1 Smoothie)+tip= $23
Answer:
5x+3=23
Step-by-step explanation:
Answer:
$4 per smoothie
Step-by-step explanation:
5x+4=23
use spherical coordinates. evaluate ∭E (x² + y²) dv, where e lies between the spheres x² + y² + z² = 9 and x² + y² + z² = 16.
The value of ∭E (x² + y²) dv over the region E between the given spheres.
To evaluate the integral ∭E (x² + y²) dv using spherical coordinates, we first need to express the volume element dv in terms of spherical coordinates.
In spherical coordinates, the volume element is given by dv = r² sin(φ) dr dφ dθ, where r represents the radial distance, φ represents the polar angle, and θ represents the azimuthal angle.
Since we are integrating over the region E between the spheres x² + y² + z² = 9 and x² + y² + z² = 16, the limits of integration for r, φ, and θ will be as follows:
r: from the lower sphere to the upper sphere, which corresponds to r = 3 to r = 4
φ: from 0 to π (since we are considering the entire range of polar angle)
θ: from 0 to 2π (since we are considering the entire range of azimuthal angle)
Now, let's substitute these values and evaluate the integral:
∭E (x² + y²) dv = ∭E (r² sin(φ) cos²(θ) + r² sin(φ) sin²(θ)) dr dφ dθ
Integrating over θ from 0 to 2π, and integrating over φ from 0 to π, we have:
∭E (x² + y²) dv = ∫[0,2π] ∫[0,π] ∫[3,4] (r² sin(φ) cos²(θ) + r² sin(φ) sin²(θ)) dr dφ dθ
Now, we can evaluate the integral by performing the integration step by step, starting from the innermost integral.
After evaluating the integral, the final result will give us the value of ∭E (x² + y²) dv over the region E between the given spheres.
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Does the boxplot represent the information given in the histogram?
A) Yes
B) No, the boxplot should be skewed right
C) No, the median should be in the middle of the box
D) No, the left whisker should extend to zero
E) No, the right whisker should extend to 55
To determine whether the boxplot represents the information given in the histogram, we need to examine the characteristics of both the boxplot and the histogram.
The boxplot provides a visual representation of the distribution of a dataset, showing the minimum, first quartile, median, third quartile, and maximum values. It also displays any outliers that may be present. On the other hand, a histogram provides a graphical representation of the frequency or count of data values within specified intervals or bins.
Without specific information or visuals of the boxplot and histogram in question, it is not possible to directly compare them and determine their compatibility. Therefore, it is not possible to answer the question based on the information provided.
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slope of (9,3) (19,-17) using slope formula
Q5. If X represents the shear strength of 3/8-inch anchor bolts, the sample size is 78, the sample mean i = 4.25, s = 1.30, and u represents the true share strength. a. Find the 2-sided 90% confidence interval for u. b. Compute a 90% confidence lower bound for u.
The 90% confidence lower bound for u is: u>4.066
To find the confidence intervals for the true shear strength u, we will use the sample mean, sample standard deviation, and the given sample size.
a. Two-Sided 90% Confidence Interval for u:
The formula for the confidence interval is given by:
x' = z × s/√n < u < x' +z × s/√n
Where:
x' is the sample mean (given as 4.25)
s is the sample standard deviation (given as 1.30)
n is the sample size (given as 78)
z is the z-score corresponding to the desired confidence level (90% confidence level has z-score of 1.645)
Plugging in the values and simplifying:
4.25 - 0.184 < u < 4.25 + 0.184
Therefore, the 2-sided 90% confidence interval for u is:
4.066 < u < 4.434
b. 90% Confidence Lower Bound for u:
The formula for the confidence interval lower bound is given by:
x' - z × s/√n < u
Plugging and simplifying the values we get:
Simplifying the expression:
4.25 - 0.184 < u
Therefore, the 90% confidence lower bound for u is:
u > 4.066
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The lifetimes of Triple X TV Tubes are approximately normally distributed with mean 13.2 years and standard deviation 3.5 years. Consider the distribution of sample means for all samples of 100 Triple X TV tubes.
Part A
What is the standard error, to two decimal places, of the sample means? Give your answer to two decimal places in the form x.xx
Standard error: ?
Part B
And what is the mean of the sample means? Give your answer to one decimal place in the form xx.x or x.x as appropriate
Mean of sample means: ?
In Part A: Standard error = 3.5 / √100 = 3.5 / 10 = 0.35 years and in Part B: the mean of the sample means is 13.2 years.
Part A: The standard error of the sample means can be calculated using the formula: standard deviation / square root of the sample size. In this case, the standard deviation is 3.5 years and the sample size is 100. So, the standard error is given by:
Standard error = 3.5 / √100 = 3.5 / 10 = 0.35 years
Part B: The mean of the sample means is equal to the population mean, which is 13.2 years. When we take multiple samples from a population, the mean of those sample means is expected to be equal to the population mean. In this case, the mean of the sample means is 13.2 years. The standard error of the sample means is 0.35 years, indicating the average deviation of the sample means from the population mean. The mean of the sample means is 13.2 years.
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Verify the following properties of the Fourier transform 1. (Fu)(E) = 27 (F-\u) (-) 2. (F(t,0)) (E) - (FU)(8 + a)
The properties of the Fourier transform stated in (1) and (2) are incorrect.
How to find that are the given properties of the Fourier transform (1) and (2) accurate?The properties of the Fourier transform stated in (1) and (2) are incorrect.
Let's examine each property:
(1) (Fu)(E) = 27 (F-\u) (-):
The expression on the left side, (Fu)(E), represents the Fourier transform of a function u evaluated at frequency E.
However, the expression on the right side, 27 (F-\u) (-), is not a valid representation of the Fourier transform.
The notation (F-\u) (-) is unclear and does not align with the standard conventions of the Fourier transform.
(2) (F(t,0))(E) - (FU)(8 + a):
Similarly, the expression on the left side, (F(t,0))(E), suggests the Fourier transform of a function F evaluated at time t and frequency E.
However, the subtraction of (FU)(8 + a) is not a well-defined operation in the context of the Fourier transform. The relationship between F(t,0) and FU is not clear, and the addition of 8 + a lacks proper justification.
Therefore, both properties (1) and (2) provided for the Fourier transform are inaccurate.
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Let X be a normal random variable with a mean of 0.33 and a standard deviation of 2.69.
a)Calculate the corresponding standardized value (z) for the point x = 4.1. Give your answer to 2 decimal places.
z =
b)The area under the standard normal probability density function from negative infinity to z is interpreted as the probability that the random variable is:
less than or equal to z
equal to z
greater than or equal to z
a) the corresponding standardized value (z) for x = 4.1 is approximately 1.39.
b) The area under the standard normal probability density function from negative infinity to z is interpreted as the probability that the random variable is less than or equal to z.
a) To calculate the standardized value (z) for the point x = 4.1, we can use the formula:
z = (x - μ) / σ
where x is the value, μ is the mean, and σ is the standard deviation.
In this case, x = 4.1, μ = 0.33, and σ = 2.69. Plugging these values into the formula:
z = (4.1 - 0.33) / 2.69
z ≈ 1.39
So, the corresponding standardized value (z) for x = 4.1 is approximately 1.39.
b) The area under the standard normal probability density function from negative infinity to z is interpreted as the probability that the random variable is less than or equal to z.
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Exercises for Data Analytics Exercise Sheet-4 The fourth exercise is about linear regression. (4.1) Use "airquality" data set which provides air quality measurements in New York. (a) Identify variables which are strongly/weakly positively/negatively correlated. (b) Use t test and check if temperature is significantly different from 79. (c) Split the data into sample A with observations 1 to 77 and sample B with observations 78 to 153. Use t test and check if temperature is significantly different between samples A and B.
a) Variables strongly/weakly positively/negatively correlated in the "airquality" data set can be identified through correlation analysis.
b) The t-test can be used to check if the temperature variable in the "airquality" data set is significantly different from 79.
c) The t-test can be used to check if the temperature variable is significantly different between samples A and B (observations 1 to 77 and 78 to 153, respectively) in the "airquality" data set.
How to find the correlation analysis and t-tests applied to the "airquality" data set for variable identification and significance testing?a) To identify variables that are strongly/weakly positively/negatively correlated in the "airquality" data set, correlation analysis can be performed.
Correlation analysis measures the strength and direction of the linear relationship between variables.
By calculating correlation coefficients (such as Pearson's correlation coefficient), it is possible to determine if variables have a strong positive correlation (close to +1), weak positive correlation (between 0 and +1), strong negative correlation (close to -1), or weak negative correlation (between 0 and -1).
This analysis helps identify the nature of the relationships between variables in the dataset.
b) To check if the temperature variable in the "airquality" data set is significantly different from 79, a t-test can be conducted.
The t-test assesses whether the mean of a sample is significantly different from a hypothesized value (in this case, 79).
By comparing the t-statistic calculated from the sample data to the critical t-value at a given significance level, such as 0.05, it can be determined if the temperature is significantly different from 79.
If the calculated t-value falls outside the critical t-value range, the temperature variable is considered to be significantly different.
c) To check if the temperature variable is significantly different between samples A (observations 1 to 77) and B (observations 78 to 153) in the "airquality" data set, a t-test can also be used.
This comparison aims to determine if the means of temperature in samples A and B are significantly different.
By calculating the t-statistic and comparing it to the critical t-value at a chosen significance level, such as 0.05, it can be determined if the temperature variable differs significantly between the two samples.
If the calculated t-value falls outside the critical t-value range, it indicates a significant difference in temperature between samples A and B.
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2) On a map, the scale is 1 inch represents 150 miles. If the map distance is 3 inches, find the actual distance.
Answer:
150*3= 450 miles
Hope this helped :)
HELPPPO !% PT PLZZZZZZZZZZZZZZZZZZZZZ
Answer:
6/12, 2/4,
Step-by-step explanation:
6/12 because half of 12 is 6.
2/4 because half of 4 is 2.
Both can equal 1/2.