Monday 4 June 2012

Twelve randomly-chosen students were asked how many times

Twelve randomly-chosen students were asked how many times they had missed class during a certain semester, with this result: 2, 1, 5, 1, 1, 3, 4, 3, 1, 1, 5, 18. For this sample, the standard deviation is approximately _____.
A.   3.75 B.   4.55 C.   4.75 D.   3.03
 

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