Homework Help: statistics

Posted by Anonymous on Friday, December 10, 2010 at 6:31pm.

the j.o supplies company buys calculators from a supplier. The probability of a defective calculator is 10%. If 100 calculators are selected at random, what is the standard deviation of the number of defectives.

statistics - MathGuru, Friday, December 10, 2010 at 9:00pm
Standard deviation = √npq
n = 100
p = .1
q = 1 - p

I'll let you take it from here.

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