If you are rounding 58 to the nearest ten, the answer is 60.
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There are 60 thousandths in the second number. There are only 58 thousandths in the first.
The fraction would be 58/60 which can be reduced to 29/30.
54, 56, 58, 60, 62, 64, 66, 68, 70, 72
Mean of 10 numbers is 58 so sum of 10 numbers is 580. One of them is 40 so the sum of the remaining nine is 540. So mean of the remaining nine is (their sum)/9 = 540/9 = 60 don't know if I'm understanding right but isn't it roughly 3.60
60!/55! x 5! = 60 x 59 x 58 x 57 x 56/5 x 4 x 3 x 2 = 5,461,512