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Thinking about distributions that show gaps or clusters, which of the following statements is true?

I. When there are multiple clusters in a distribution it is most appropriate to use the mean as the measure of center.

II. Gaps in distributions are caused by poor data collection procedures.

III. A distribution composed of multiple subgroups does not always show clusters in its histogram.

A

I only.

B

II only.

C

III only.

D

I and III only.

E

II and III only.

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