Question 4 (14.9 points)
Use the central limit theorem if
possible. For a sample of n = 9,
find the probability of a sample
mean being less than 7 given = 8
and = 3. The population is not
normally distributed.
34.1%
34.1%
13.696
13.696
0.1587
0 0.3694
0.8413
O Cannot be determined because the sample size is too small.

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years