Question

The time that it took students to complete an obstacle course in Gym class follows a normal distribution.

The mean time is 21 minutes with a standard deviation of 4 minutes.
If Ashley's time to complete the obstacle course corresponds to a z-score of -1.2, how long did it take her to complete the course?

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Answer 1

Use x = μ + zσ. So x = 21 + (−1.2)(4) = 21 − 4.8 = 16.2 minutes.