Walleye is a common game fish. Adult walleye have a length with a mean of 48 cm and a standard deviation of 3 cm and the distribution of lengths is approximately Normal. What fraction of walleye are shorter than 45 cm in length?

Answer 1

15.9% of the fish have lengths more than 1 standard deviation below the mean

Answer 2

45-48 divided by 3

-1 = z score

find z< -1 use a z-table or a calculator to find the p-value
which is 15.9%