Posted by **Karen** on Wednesday, September 2, 2009 at 3:50pm.

The lifetime of a 2-volt non-rechargeable battery in contant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. Ninety percent of all batteries have a lifetime less than ?

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**bobpursley**, Wednesday, September 2, 2009 at 4:13pm
see the other post.

- Statistics -
**Anonymous**, Monday, January 30, 2012 at 8:33pm
541.6

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