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N76 [4]
2 years ago
5

A local store buys used video games. For each game bought, they would pay $18 less than the original price paid for the game. Wh

at expressions represents the total amount you get if you sell n games that originally cost d dollars each
Mathematics
1 answer:
Sonbull [250]2 years ago
7 0

Answer:

total amount =  n (d-18)

total amount = dn - 18n

Step-by-step explanation:

given data

pay  = $18 less than the original price

originally cost =  d dollars

sell  = n games

solution

we take original price paid for the game = d

and they will pay $18 less than the original price

so that can we say

d -18

and

when sold n games than the cost of n used games will be here

cost = n (d-18)

so it can express as

total amount =  n (d-18)

total amount = dn - 18n

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spayn [35]

Answer:

60.26% probability that less than twenty students are absent

Step-by-step explanation:

Binomial probability distribution

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The expected value of the binomial distribution is:

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The standard deviation of the binomial distribution is:

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Normal probability distribution

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

When we are approximating a binomial distribution to a normal one, we have that \mu = E(X), \sigma = \sqrt{V(X)}.

In this problem, we have that:

n = 120, p = 0.15.

So

\mu = E(X) = np = 120*0.15 = 18

\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{120*0.15*0.85} = 3.91

If a random sample of 120 names is called on a Monday, what is the probability that less than twenty students are absent?

This is the pvalue of Z when X = 20-1 = 19. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{19 - 18}{3.91}

Z = 0.26

Z = 0.26 has a pvalue of 0.6026.

60.26% probability that less than twenty students are absent

3 0
3 years ago
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Answer:

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24.12

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4 0
2 years ago
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My mother is 43 years old.I am w years old. Write an expression as to how old we will both be in h year's time.​
Y_Kistochka [10]

Answer:

W+h=         43+h=

Step-by-step explanation:

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3 years ago
The design for the palladium window shown includes a semicircular shape at the top. The bottom is formed by squares of equal siz
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Answer:

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Step-by-step explanation:

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See attachment for window

Solving (a): Area of the window

First, we calculate the dimension of each square

Let the length be L;

So:

L^2 = A_1

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L = \sqrt{169

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So:

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r = 2*13

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Next, calculate the area of the larger square.

16 small squares made up the larger square.

So, the area is:

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A_3 = \frac{\pi r^2}{2}

A_3 = \frac{3.14 * 26^2}{2}

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Area = A_2 + A_3

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Solving (b): Area of the shade

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