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September 19, 2014

September 19, 2014

Posted by **harish** on Wednesday, February 13, 2013 at 7:22am.

Calculate the interval, symmetrical about the mean within which 75% of the battery lifetimes lie.

- maths -
**Reiny**, Wednesday, February 13, 2013 at 10:24amThe following applet takes the place of your tables or charts traditionally used for this kind of work

http://davidmlane.com/normal.html

click on : value from an area

enter 0.75 in "area"

enter 160 in "mean"

enter 30 in "SD"

under "results" click "between"

click on "recalculate" to get

125.5 to 194.5

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