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Assume X is normally distributed with a mean of 20 and a variance of 16. find...

Assume X is normally distributed with a mean of 20 and a variance of 16. find the following using the Z tables.

a.) P(x<15)

b.) P(x>10)

c. P (X>x)=0.95

D.) P (3<X<x)=.90

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