Math miscellaneousHard

Question

If the mean deviation of number 1, 1 + d, 1 + 2d, ....., 1 + 100d from their mean is 255, then the d is equal to

Options

A.10.0
B.20.0
C.10.1
D.20.2

Solution

[1 + 1 + 100d] = 1 + 50d
[50d + 49d + 48d +...+ d + 0 + d + ... + 50d]
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