Posted by **Michelle** on Monday, May 16, 2011 at 5:20pm.

A history class has 75 members. If there is a 12% absentee rate per class meeting, find the mean, variance, and atandard deviation of the number of students who will be absent from each class

- statistics -
**MathGuru**, Monday, May 16, 2011 at 5:24pm
Mean = np = (75)(.12) = ?

Variance = npq = (75)(.12)(.88) = ?

(Note: q = 1 - p)

Standard deviation = square root of the variance

I'll let you finish the calculations.

- statistics -
**Sam**, Monday, December 2, 2013 at 8:54pm
Mean=9

Variance=792

Standard Deviation=28.14

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