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Find the mean deviation about the mean for the data :{x}_{{i}}
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Find the mean deviation about the mean for the data : 10 30 50 70 90 4 24 28 16 8

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If the standard deviation of the numbers is then which of the following is true ?

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Find the mean deviation about the mean for the data : 10 30 50 70 90 4 24 28 16 8