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3 years ago

Work out values a,b,c,d

Mathematics

1 answer:

Dovator [93]3 years ago

8 0

Since u have a blank black screen the answer has to be A

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Customers enter a shop at a rate of four each hour. i. What is the probability that no customer enters from 5 : 30 to 6 : 00pm?

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Answer:

Step-by-step explanation:

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2 years ago

May someone help me plz!!!!!!!!!!!!ASAP!!!!!!!!!!!!!!!!!

katovenus [111]

(a) x = 0.36--, 100x = 36.36--, 100x-x = 36, x = 36/99 = 4/11
(b) x = 0.36-, 100x = 36.6-, 100x-x = 36.3, x= 363/990=11/30
(c) 36/100 = 9/25

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3 years ago

Solve 2/3x+1/2y=2 For y

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Step-by-step explanation:

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4 years ago

A regression analysis yields the line: y = 12 - 2x

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3 years ago

The Student Monitor surveys 1200 undergraduates from 100 colleges semiannually to understand trends among college students. Rece

nlexa [21]

Answer:

A sample size of 385 is needed.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

You feel that a reasonable estimate of the standard deviation is 10.0 hours.

This means that $\sigma = 10$

What sample size is needed so that the expected margin of error of your estimate is not larger than one hour for 95% confidence?

A sample size of n is needed. n is found when M = 1. So

$M = z\frac{\sigma}{\sqrt{n}}$

$1 = 1.96\frac{10}{\sqrt{n}}$

$\sqrt{n} = 1.96*10$

$(\sqrt{n})^2 = (1.96*10)^2$

$n = 384.16$

Rounding up:

A sample size of 385 is needed.

7 0

3 years ago