whats wrong?

the mean is the sum of the mid points of each class times the class frequency divided by the total frequency

and then the standard deviation is

its just a simple formula where are you having trouble ?

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- Feb 5th 2008, 04:34 PM #1

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- Feb 5th 2008, 04:54 PM #2

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- Feb 5th 2008, 05:25 PM #3

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- Feb 5th 2008, 05:43 PM #4

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