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The mean deviation of the data 2,9,9,3,6,9,4 from the mean is

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Important Questions on Statistics

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The mean and variance of a binomial distribution are 8 and 4 respectively, then P( X=1 ) is equal to
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The standard deviation of the data 6,5,9,13,12,8,10 is
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The variance of first 20 natural numbers is