SOLUTION: Given that X is a normal random variable with a mean of 25 and standard deviation 3, find the probability P(X < 20) Please please help.

Algebra ->  Probability-and-statistics -> SOLUTION: Given that X is a normal random variable with a mean of 25 and standard deviation 3, find the probability P(X < 20) Please please help.      Log On


   

Question 954199: Given that X is a normal random variable with a mean of 25 and standard deviation 3, find the probability
P(X < 20)
Please please help.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Find the z score.
z=%28x-mu%29%2Fsigma=%2820-25%29%2F3=-5%2F3
P%28z=-5%2F3%29=0.04779