Someone is telling you how to calculate the SD of the list 1, 2, 3, 4, 5:
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Someone is telling you how to calculate the SD of the list 1, 2, 3, 4, 5:
The average is 3, so the deviations from average are
-2 -1 0 1 2 The 0 doesn't count, so the r.m.s. deviation is
$$
\sqrt{\frac{4+1+1+4}{4}} = 1.6
$$
And that's the SD.
Is this right? Answer yes or no, and explain briefly. p-968
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