Suppose that the average screen time for all students at this middle school is 2 hours, with a standard deviation of 0.6 hours. A random sample of 36 students turns out to have an average of 2.2 hours? Calculate a standardized score for this sample average.

Answer:

(-6, -7)

Step-by-step explanation:

For the x coordinates:

-1 - 4 = -5

-1 + -5 = -6

For the y coordinates:

-5 + -3 = -2

-5 + -2 = -7

I don't know how to explain it well sorry

The value of df(4)/dx is  (-e⁻⁴ + e⁴)/2 when function f(x) is cosh(x).

To find df(4)/dx, we need to differentiate the function f(x) = cosh(x) with respect to x.

Using the chain rule, the derivative of f(x) with respect to x is given by:

df(x)/dx = d/dx [cosh(x)]

To differentiate cosh(x), we can use the derivative of e^x, which is e^x, and apply the chain rule:

df(x)/dx = d/dx (e⁻ˣ + eˣ)/2

Applying the chain rule to each term separately:

df(x)/dx = (d/dx [e⁻ˣ ] + d/dx [eˣ))/2

The derivative of e⁻ˣ is -e⁻ˣ, and the derivative of eˣ is eˣ:

df(x)/dx = (-e⁻ˣ+ eˣ)/2

Now, to find df(4)/dx, we substitute x = 4 into the derivative:

df(4)/dx = (-e⁻⁴ + e⁴)/2

This is the value of df(4)/dx for the function f(x) = cosh(x).

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Answer:

i got u fam!!!!!!!!!!!!!!!

its 15625

Step-by-step explanation:

Eliza's math book weighs 3⁶⁵/₇₂ pounds, based on fractional subtractions.

Fractional subtraction involves the subtraction of a number with fractions from another.

Subtraction is one of the four basic mathematical operations, including addition, multiplication, and division.

Fractions are portions or parts of a whole value and may be classified as proper, improper, or complex.

The weight of the backpack with Eliza's math book = 18⁷/₉ pounds

The weight of the backpack without Eliza's math book = 14⁷/₈ pounds

The weight of the math book = 3⁶⁵/₇₂ (18⁷/₉ - 14⁷/₈) pounds

Thus, using fractional subtractions, we can conclude that Eliza's math book weights 3⁶⁵/₇₂ pounds.

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Question Completion

Eliza’s backpack weighs 18⁷/₉ pounds with her math book in it. Without her math book, her backpack weighs 14⁷/₈ pounds. How much does Eliza’s math book weigh?

Answer: curve shape of something

Step-by-step explanation:

Answer:

Hey mate......

Step-by-step explanation:

This is ur answer.......

A parabola is a curve where any point is at an equal distance from: a fixed point (the focus), and. a fixed straight line (the directrix)

Hope it helps!

mark me brainliest pls.......

Follow me! :)

By using structured references, the formulas will automatically refer to the data within the column of the Excel Table, even if the table expands or shrinks when you add or remove data.

To convert the data into an Excel Table and perform the analysis using structured references, you can follow these steps:

Select the entire data range, including the headers and the values.

In the Excel menu, go to the "Insert" tab and click on "Table." Choose a table style that you prefer.

Excel will automatically detect the range of your data. Make sure to check the box that says "My table has headers" if your data has headers.

Click "OK" to create the Excel Table.

Once you have created the Excel Table, you can perform the analysis and display the summary statistics using structured references. Here's how you can do it:

To calculate the Mean, use the formula =AVERAGE(Table1[LO]) and place it above the "LO" column header.

To calculate the Median, use the formula =MEDIAN(Table1[LO]) and place it above the "LO" column header.

To calculate the Minimum, use the formula =MIN(Table1[LO]) and place it above the "LO" column header.

To calculate the Maximum, use the formula =MAX(Table1[LO]) and place it above the "LO" column header.

To calculate the 75th percentile, use the formula =PERCENTILE.INC(Table1[LO],0.75) and place it above the "LO" column header.

To calculate the 25th percentile, use the formula =PERCENTILE.INC(Table1[LO],0.25) and place it above the "LO" column header.

To calculate the Interquartile Range, use the formula =QUARTILE.INC(Table1[LO],0.75) - QUARTILE.INC(Table1[LO],0.25) and place it above the "LO" column header.

To calculate the Variance, use the formula =VAR(Table1[LO]) and place it above the "LO" column header.

To calculate the Standard Deviation, use the formula =STDEV(Table1[LO]) and place it above the "LO" column header.

Make sure to adjust the table name (Table1) and column reference (LO) in the formulas based on your actual table and column names.

By using structured references, the formulas will automatically refer to the data within the column of the Excel Table, even if the table expands or shrinks when you add or remove data.

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Answer:

A transformation that turns a figure around a fixed point, called the center of rotation. hope this helps

Step-by-step explanation:

Answer:

30 or 780 is your answer for the first one. i dont know how to work out the answer for the 2 one im sorry :(

Step-by-step explanation:

13+12+5 = 30

13 x 12 x 5 = 780

I would go for 780

it seems more like to be the answer

The benefit: Savings accounts typically have higher interest rates than checking, making it easy for you to grow your money faster. ... Going over that limit can result in a fee or, if you do it multiple times, your bank might convert the account to checking.

bought for $180000 in 2002

sold it in 2014

180000*2.44\100

1. The difference between a sequence and a series is that a sequence is an ordered list of numbers, while a series is the sum of the terms in a sequence.

2. To solve series and sequence questions, various techniques can be used, such as finding patterns, using formulas, or applying mathematical operations like addition, subtraction, multiplication, or exponentiation.

3. Counting and probability are branches of mathematics that deal with quantifying and analyzing the likelihood of events. Counting involves determining the number of possible outcomes in a given situation.

4. The three principles of counting are the multiplication principle, the addition principle, and the principle of complementary counting.

1. A sequence is an ordered list of numbers, typically denoted as a₁, a₂, a₃, ..., where each term in the sequence is identified by its position or index. For example, {1, 3, 5, 7, 9} is a sequence. On the other hand, a series is the sum of the terms in a sequence. For instance, the series corresponding to the sequence mentioned earlier would be 1 + 3 + 5 + 7 + 9.

2. To solve series and sequence questions, it is important to look for patterns or relationships between the terms. For sequences, one can identify a pattern and use it to generate subsequent terms. In series, formulas or techniques like finding the sum of an arithmetic or geometric progression can be applied.

3. Counting involves determining the number of possibilities or outcomes in a given situation. It can involve simple counting principles or more complex techniques like combinations and permutations. Probability, on the other hand, deals with quantifying the likelihood of events. It uses mathematical calculations to determine the probability of specific outcomes or events occurring.

4. The three principles of counting are fundamental rules used in counting problems:

The multiplication principle states that if there are 'm' ways to do one thing and 'n' ways to do another, then there are 'm x n' ways to do both.

The addition principle states that if there are 'm' ways to do one thing and 'n' ways to do another, then there are 'm + n' ways to choose one of the two options.

The principle of complementary counting states that if there are 'm' ways to do something, then there are 'm' ways not to do it. By subtracting the number of ways not to do something from the total number of possibilities, one can determine the desired outcome.

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Answer : P(x) = 25,000x + 1,730,000P(x) represents the population of Phoenix after x years since 2020.

Explanation:

Given information: The population of Phoenix in 2020 was approximately 1,730,000 and the city's population grew by 25,000 people in 2020.

Model for the population of Phoenix x years after 2020 if it continues to grow by 25,000 people per year:

To find the population of Phoenix after x years since 2020, we need to add the number of people that moved into Phoenix since 2020, i.e., 25,000 people per year.

If x represents the number of years since 2020, then the model is given as follows:

P(x) = 25,000x + 1,730,000P(x) represents the population of Phoenix after x years since 2020.

We need to add 1,730,000 to 25,000x because 1,730,000 is the initial population in 2020.

Therefore the required model P(x) = 25,000x + 1,730,000P(x) represents the population of Phoenix after x years since 2020.

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(a) The sample space for this game is the set of numbers on the wheel are 00, 0, 1, 2, ..., 38.

For this game of chance with a wheel consisting of 40 slots, the sample space is defined as the set of all possible numbers that the metal ball can fall into. The numbers range from 00 to 38, including both the double zero and single-digit numbers.

(b) The probability of the ball landing in the slot marked 4 is 1/40, which is equivalent to 0.025 when rounded to four decimal places.

To determine the probability that the metal ball falls into the slot marked 4, we need to calculate the ratio of the favorable outcomes (the ball landing in slot 4) to the total number of possible outcomes.

There is only one slot marked 4, so the number of favorable outcomes is 1. The total number of possible outcomes is 40 since there are 40 slots on the wheel.

This means that if the game is played many times, we can expect the ball to land in slot 4 approximately 0.025 (or 2.5%) of the time.

(c) The probability that the metal ball lands in an odd slot is 0.5.

To determine the probability that the metal ball lands in an odd slot, we count the number of odd slots on the wheel. Odd numbers occur every other slot starting from 1, so there are a total of 20 odd slots on the wheel.

The probability of the ball landing in an odd slot is given by the ratio of the number of odd slots to the total number of possible outcomes. Therefore, the probability is 20/40, which simplifies to 1/2 or 0.5 when rounded to four decimal places.

This means that if the game is played many times, we can expect the ball to land in an odd slot approximately 0.5 (or 50%) of the time.

The correct choices are:

(b) If the wheel is spun 1000 times, it is expected that about 25 of those times result in the ball landing in slot 4.

(c) If the wheel is spun 100 times, it is expected that exactly 50 of those times result in the ball landing on an odd number.

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Answer:

Distance from the moon is 2.4 × 10⁵ miles

Step-by-step explanation:

Length of 1-inch paperclip = [tex]1.6\times 10^{-5}[/tex] miles

Number of paperclips used to reach the moon = 1.5 × 10¹⁰

Total distance from the moon = Number of paper clips used × Length of one clip

= (1.5 × 10¹⁰) × (1.6 × 10⁻5)

= (1.5 × 1.6) (10¹⁰× 10⁻⁵)

= 2.4 × 10⁽¹⁰⁻⁵⁾ miles

= 2.4 × 10⁵ miles

Distance from the moon is 2.4 × 10⁵ miles.

According to the question the correct option is c. Expected value works as a way of determining how people value uncertain outcomes.

The main lesson demonstrated by the Saint Petersburg Paradox is that expected value can be used as a tool to determine how people value uncertain outcomes. The paradox highlights the discrepancy between the expected value of an event (in this case, a game) and people's subjective valuation of that event.

Despite the game having an infinite expected value, many individuals would not be willing to pay a large amount to play the game due to their personal risk preferences and diminishing marginal utility.

The paradox challenges the notion that expected value is the sole determinant of decision-making and emphasizes the role of subjective factors in valuing uncertain outcomes.

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y=15x+50 it should look something like that

The investor should invest $40,000 in Company A and $40,000 in Company B to maximize their investment returns.

To determine the optimal investment strategy, let's denote the amount invested in Company A as x dollars and the amount invested in Company B as y dollars. The investor has set a maximum capital loss of $2,000 for each company. Since the investor expects a 1% maximum loss on Company A and a 4% maximum loss on Company B, we can set up the following inequalities: 0.01x ≤ $2,000 and 0.04y ≤ $2,000. Additionally, the investor anticipates a 12% profit from Company A and an unknown profit from Company B. Let's denote the profit from Company B as p. Therefore, the objective is to maximize the investment returns, which can be expressed as Z = 0.12x + p. The total investment constraint is x + y = $80,000. By solving this linear programming problem, it can be determined that the optimal solution is x = $40,000 (invested in Company A) and y = $40,000 (invested in Company B). Consequently, the optimal profit will be 0.12($40,000) + p.

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The joint relative frequency for people who can only see the sunset is  7/38.

To find the joint relative frequency for people who can only see the sunset, we need to look at the corresponding cell in the two-way frequency table. Let's assume the cell value is x. The total number of observations in the table is the sum of all the cell values, which is 38 in this case.

The joint relative frequency is the ratio of the cell value to the total number of observations. Therefore, the joint relative frequency for people who can only see the sunset is x/38.

Out of the given options, the value of x/38 that equals 7/38. Therefore, 7/38 represents the joint relative frequency for people who can only see the sunset based on the provided two-way frequency table.

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Answer: this link will help you out

Step-by-step explanation:              https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-linear-equations-functions/constructing-linear-models-real-world/v/word-problem-solving-4

The Lewis family used their sprinkler for 30 hours, while the Pham family used theirs for 25 hours.

Let's assume x represents the number of hours the Lewis family used their sprinkler, and y represents the number of hours the Pham family used their sprinkler. We can set up a system of equations based on the given information.

Equation 1: x + y = 55 (The combined total of hours)

Equation 2: 30x + 25y = 1475 (The total water output in liters)

To solve this system of equations, we can use substitution or elimination methods. By solving Equation 1 for x and substituting it into Equation 2, we get:

30(55 - y) + 25y = 1475

1650 - 30y + 25y = 1475

-5y = -175

y = 35

Substituting the value of y into Equation 1, we find:

x + 35 = 55

x = 20

Therefore, the Lewis family used their sprinkler for 20 hours, while the Pham family used theirs for 35 hours.

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Answer:

7/8

Step-by-step explanation:

Answer:

7/8

Step-by-step explanation:

simplify 875/1000

A form a basis for R3.

To show that the columns of A form a basis for R3 , we need to show that they are linearly independent and span R3.

To show linear independence, we need to find constants c1 , c2 and c3 , not all zero , such that c1(4,1,0) + c2 (1,0,-2) + c3(0,1,-5) = (0,0,0).

This gives us a system of linear equations , which we can write in augumented matrix form as :

[4 1 0 | 0]

[1 0 1 | 0]

[0 -2 -5 | 0]

we can use row operations to reduce this matrix to row echelon form:

[4 1 0 | 0]

[0 -2 -5 | 0]

[0 0 1 | 0]

From this we can see that the only solution is c1 = c2 = c3 = 0, which means that columns of A are linearly independent.

To show that the columns of A span R3 , we can take any vector

(x, y, z) in R3 and write it as a linear combination of the columns of A :

(x, y, z) = a(4,1,0) + b(1,0,-2) + c(0,1,-5)

Solving for a , b and c, we get

a = (4x - y)/ 14

b = (2y + 5z - 2x)/ 14

c = -z/ 14

Since we can express any vector in R3 as a linear combination of the columns of A, they span R3 .

Therefore , the columns of A form a basis for R3.

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Answer:

A =28.26

Step-by-step explanation:

Using the area formula

A = pi r^2

We use pi = 3.14 and the radius is 3

A = 3.14 * (3)^2

A = 3.14 *9

A =28.26

Answer:

89 people

Step-by-step explanation:

Answer:

Step-by-step explanation:

960 which is the area u divide by the one foot which is 144 square units to get your answer,6.66666666667

The statement that is correct about the simple shortest path problem is: The problem is ill-posed if the graph contains a negative-length cycle.

If the graph has a negative-length cycle, the shortest path will loop around that cycle an infinite number of times and, as a result, it is difficult to find the shortest path.

The Simple Shortest Path problem is a popular algorithmic issue in computer science. It is well-known that this issue may be solved in O(m log n) time using a variety of algorithms.

Dijkstra’s algorithm is a simple algorithm that is usually used to solve this issue. This algorithm works by maintaining a set of vertices that have already been visited while also maintaining a heap with all of the vertices that have yet to be explored.

The algorithm then picks the vertex with the lowest cost from the heap and processes all of its neighbours.

The cost of each neighbour is calculated by adding the weight of the edge connecting the current vertex to the neighbour vertex to the cost of the current vertex.

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The number of values in each group of the data set would be equal to the degrees of freedom for each group plus one.

In order to determine the number of values in each group of the data set based on the partially completed ANOVA table, we need to consider the total number of observations and the number of groups.

The ANOVA table consists of three main components: "Source of Variation," "Sum of Squares (SS)," and "Degrees of Freedom (df)." The "Source of Variation" represents the different factors or groups in the data set, while the "Sum of Squares" measures the variability within each group. The "Degrees of Freedom" represents the number of independent pieces of information available for estimating the population parameters.

In this case, since all groups are of the same size, we can determine the number of values in each group by examining the "Degrees of Freedom" column. The degrees of freedom for each group is the group size minus one (df = group size - 1). By adding one to the degrees of freedom for each group, we obtain the number of values in each group.

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Answer:

The amount to be repaid is $379.26.

Step-by-step explanation:

Period of note from May 1 to December 19 = 233 days

Amount of note or principal = $1,000

Simple interest rate = 8.5%

Maturity date = December 19

Repayments:

June 2 = $475

Nov. 4 =  $200

Total paid $675

Simple interest = $54.26 ($1,000 * 8.5% * 233/365)

Total amount to be repaid = $1,054.26

Total amount repaid =               675.00

Balance to be paid on maturity $379.26