SOLUTION: The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. What is the probability that a student chosen at random

Algebra ->  Probability-and-statistics -> SOLUTION: The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. What is the probability that a student chosen at random      Log On


   

Question 874729: The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. What is the probability that a student chosen at random will finish the test between 24 & 48 minutes ?
A.82%
B.2%
C.84%
D.16%
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
P( 24 < x < 48) = P(z <1) - P(z < -2) = .84 - .02 = .82 0r 82%