homework

EXAMPLE 5.Let Z be a random variable with a standard normal distribution. Find these probabilities.

(a) P( Z3.20 ) ;(b)P( -2.20 Z1.04 );(c) P( Z2.17 )

EXAMPLE 6.Assume that X has a normal distribution with the specific mean and standard deviation. Find the indicated probabilities.

(a)P(8 X 12 ) ; = 15; = 3.2

(b)P ( X90 ); = 100;= 15