If the average number of time spent on the way to work is 10 and the variance is 2, then the value of X-Y is 0 The process should be detailed`

If the average number of time spent on the way to work is 10 and the variance is 2, then the value of X-Y is 0 The process should be detailed`

X + y + 10 + 11 + 9 = 10 * 5, that is, x + y = 20
(10-x) ^ 2 + (10-y) ^ 2 + 0 + 1 + 1 = 2, that is, (10-x) ^ 2 + (10-y) ^ 2 = 0
From the above two formulas, we can get x = y = 10

Elden Ring Premiere

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