Question 6 involves statistics

Question

A normal distribution is observed from the times to complete an obstacle course. The mean is 69 seconds and the standard deviation is 6 seconds. Using the Empirical Rule, what is the probability that a randomly selected finishing time is greater than 87 seconds?

Answer 1

1. convert 87 to it should z-score: (87-69)/6=3
2. look up z-table for right tail area beyond 3 to get 0.0013 as the answer.