Posted by **tara** on Saturday, May 12, 2012 at 8:46pm.

a company manufactures batteries in batches of 18 and there is a 3% defect rate. Find the standard deviation for a number of defects per batch?

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**MathGuru**, Monday, May 14, 2012 at 8:18pm
standard deviation = √npq = √(18 * .03 * .97) = ?

Note: q = 1 - p

I'll let you finish the calculation.

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**Lisa**, Sunday, December 25, 2016 at 12:10pm
A company manufactures batteries in batches of 15 and there is a 3% rate of defects. Find the standard deviation for the number of defects per batch

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