SOLUTION: The time a group of high school students arrive home from school each day was found to be normally distributed. The mean time was 3:15 PM and the times had a standard deviation of

Question 41886: The time a group of high school students arrive home from school each day was found to be normally distributed. The mean time was 3:15 PM and the times had a standard deviation of 15 minutes. What is the probability that a student chosen at random arrives home from school before 2:30 PM?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Well 2:30 pm represents three sigmas below the mean...so look up on your normal distribution table a z-score of -3.00 and find the probability of .0013.
Thus the probability is .13% that a student chosen at random arrives before 2:30 pm.
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