Majesty video production inc. wants the mean length of its advertisements to be 24 seconds. assume the distribution of ad length follows the normal distribution with a population standard deviation of 2 seconds. suppose we select a sample of 15 ads produced by majesty. what can we say about the shape of the distribution of the sample mean time?

It is going to be bell-shaped(normally distributed), with mean and standard deviation .

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a random variable X, with mean and standard deviation , a large sample size can be approximated to a normal distribution with mean and standard deviation .

What can we say about the shape of the distribution of the sample mean time?

It is going to be bell-shaped(normally distributed), with mean and standard deviation .

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40