The following histogram of marathon times includes data for men and women and also for both an Olympic marathon and an amateur marathon. Greater values indicate slower runners. Complete parts (a) through (c) below.

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Part 1

a. Describe the shape of the distribution.

A.

The graph is symmetric with the most times approximately in the middle.

B.

The graph is right-skewed.

C.

The graph is left-skewed.

D.

The graph is bimodal, with modes around 9000 seconds and around 14000 seconds.

Your answer is correct.

Part 2

b. What are two different possible reasons for the two modes? Select all that apply.

A.

The two modes could be caused by sampling error.

B.

The two modes could be caused by the different events.

C.

The two modes could be caused by gender.

D.

The two modes could be caused by different equipment being used to measure the runner's time.