A brewery's filling machine is adjusted to fill bottles with a mean of 31.9 oz. of ale and a variance of 0.004. Periodically, a bottle is checked and the amount of ale noted.

Question

(a) Assuming the amount of fill is normally distributed, what is the probability that the next randomly checked bottle contains more than 32.00 oz? (Give your answer correct to four decimal places.)
(b) Let's say you buy 109 bottles of this ale for a party. How many bottles would you expect to find containing more than 32.00 oz. of ale? (Round your answer up to the nearest whole number.)

Answer 1

a) Z = (score-mean)/SD

Variance = SD^2

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to Z.

b) Multiply probability by 109.