7 and 1/3
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6 + 10 + 8 + 7 + 9= 40----------you have 5 integers, so......40/5= 8=====the arithmetic average, or the mean of these numbers
3, 4, 5, 6, 7, 8, 9, 10, 11
((9 - 5) x 8) - 8
The variance of 5 9 8 9 9 = 3
9/8 x 5/8 = 0.703125 9/8 x 5/8 = 45/64