Standard deviation of 7, 7, 7, 7, 7 is ................... .
0
Standard deviation measures how far observations lie from their mean. Here the mean is (7 + 7 + 7 + 7 + 7) / 5 = 7.
Every deviation from the mean is 7 - 7 = 0, so the sum of squared deviations is 0 and the variance is 0 / 5 = 0.
The standard deviation is the square root of variance, which is the square root of 0 = 0. A set of identical values has no dispersion at all.
Hence, the answer is 0.
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