<PRE><B>Question 560128</B>
If 2% of all calculators are defective, find the mean, variance, and standard deviation of a lot of 400 

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mean = np = 400*0.02 = 8
variance = npq = 8*0.98 = 7.84
std = sqrt(npq) = sqrt(7.84) = 2.8
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Cheers,
Stan H.
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