The time it takes Jessica to bicycle to school is normally distributed with mean

Question

The time it takes Jessica to bicycle to school is normally distributed with mean 15 minutes and variance 4. Jessica has to be at school at 8:00 am. Suppose you saw her at class, and she said it took her 23 minutes to get to school that day. Which of the following is a reasonable inference or conclusion?

a. Twenty-three minutes to school is not an unusually long commute time. b. A commuting time of 23 minutes is highly unusual or atypical. c. The distribution of commute times MAY NOT be normal with mean 15 minutes and standard deviation 2 minutes. d. Both (b) and (c) are feasible conclusions. e. Both (a) and (c) are feasible conclusions.

Explanation / Answer

d. Both (b) and (c) are feasible conclusions.

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