The mean of the numbers a, b, 8, 5, 10 is 6

The mean of the numbers a, b, 8, 5, 10 is 6 and the variance is 6.80. Then which one of the following gives possible values of a and b?

(a) a = 0, b = 7
(b) a = 5, b = 2
(c) a = 3, b = 4
(d) a = 2, b = 4

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