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 When the data is large or the mean is not an integer we use assumed mean method to calculate the standard deviation.

Choose one of the items nearer to the middle value in the data say A as the assumed mean.Calculate deviation d = x - A for each value of the series and find  `sum` d ,  `sum`d2 .Substitute `sum` d ,  `sum` d2 and n in the formula and calculate the standard deviation.

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