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A variable is normally distributed with mean 13 and standard deviation 4. a. Find the percentage...

A variable is normally distributed with mean 13 and standard deviation 4.

a. Find the percentage of all possible values of the variable that lie between 8and 17.

b. Find the percentage of all possible values of the variable that are at least 9 ? %

c. Find the percentage of all possible values of the variable that are at most 7 ? %.

Math   Statistics-And-Probability   
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