People were polled on how many books they read the previous year. Initial survey results indicate that s = 12.1 books. Complete parts (a) through (d) below. Click the icon to view a partial table of critical values.
(a) How many subjects are needed to estimate the mean number of books read the provious year within four books with 90% confidence?
This 90% confidence level requires subjects. (Round up to the nearest subject.)

i dont know if you cant find a way its best to actually add all of them start from 105 tho

step-by-step explanation:

whatvare the choices

step-by-step explanation:

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).