65.
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64.99 rounded to the nearest tenth * * * * * The above answer is absolute rubbish. The geometric mean is sqrt(125*5) = sqrt(625) = 25 As it happens, the arithmetic mean is (125 + 5)/2 = 130/2 which is exactly 65. That is nearly the same as the answer given although I cannot understand why it required rounding. Furthermore, 64.99 is a number rounded to the nearest hundredth, not the nearest tenth!
5*5 = 25 25*5 = 125
The average or mean of 3, 5, 7, 9, and 11 is 7.
The mean of those data points is 9.
5