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The sums of the deviations of a set of n values x1, x2, x3,…., xn measured from 15 and -3 are -90 and 54 respectively.

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The sums of the deviations of a set of n values x1, x2, x3,…., xn measured from 15 and -3 are -90 and 54 respectively. Find the value of n and mean.

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Subtracting (I) from (II), we get

Put value of n in (I), we get

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