Question

Suppose a normal distribution has a mean of 79 and a standard deviation of 7. What is P(x< or = to 72)?

Answer 1

P( Z <= -1) = 0.1587

Explanation:

ok, mean u = 79

s = 7

find P( x <= 72)

P( (x - 79)/7 <= (72 - 79)/7 ) = ?

P( Z <= -1) = 0.1587 from Z-scores table