Question: A variable is normally distributed with mean 15 and standard deviation 4 a. Find the percentage of all possible values of the variable that lie

A variable is normally distributed with mean 15 and standard deviation 4

a. Find the percentage of all possible values of the variable that lie between 7 and 20

b. Find the percentage of all possible values of the variable that exceed 13

c. Find the percentage of all possible values of the variable that are less than 12

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