7
QuizMultiple Choice

Topic Test

Question 7 • Applications and Modeling

A drawer contains 3 red paperclips, 4 green paperclips, and 5 blue paperclips. One paperclip is taken from the drawer and then replaced. Another paperclip is taken from the drawer. Explain why this is an independent or a dependent event.

Answer
A
Independent - the first paper clip is replaced, the sample space of 12 paperclips does not change from the first event to the second event
B
Dependent - the first paper clip is replaced, the sample space of 12 paperclips does not change from the first event to the second event
C
Independent - the sample space changes from the first event to the second event
D
Dependent - the sample space changes from the first event to the second event

Explanation

The first paperclip is replaced before the second draw, so the drawer still contains 3 red, 4 green, and 5 blue paperclips. The sample space remains 12 paperclips, and the first draw does not affect the probabilities for the second draw. Therefore, this is independent: “the first paper clip is replaced, the sample space of 12 paperclips does not change.”

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