# Biostatics

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?

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

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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%

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