If the average of data x, 2x, 3x, 4x, 5x is 1, then x is (), what is the variance?
15x=5
x=1/3
Then the data are 1 / 3, 2 / 3, 1, 4 / 3, 5 / 3
Variance = (1 / 3 - 1) ^ 2 + (2 / 3 - 1) ^ 2 + (1 - 1) ^ 2 + (4 / 3 - 1) ^ 2 + (5 / 3 - 1) ^ 2 = 10 / 9
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