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For a frequency distribution mean deviat...

For a frequency distribution mean deviation from mean in computed by (a) `MdotDdot=(sumf)/(sumf|d|)` (b) `MdotDdot=(sumd)/(sumf)` (c) `MdotDdot=(sumfd)/(sumf)` (d) `MdotDdot=(sumf|d|)/(sumf)`

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According the formula
`MdotDdot=(sumf|d|)/(sumf)`
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For a frequency distribution mean deviation from mean in computed by MdotDdot=(sumf)/(sumf|d|) (b) MdotDdot=(sumd)/(sumf) (c) MdotDdot=(sumfd)/(sumf) (d) MdotDdot=(sumf|d|)/(sumf)

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