The sum of the numbers 1 to 39 = 39 x 40 ÷ 2 = 780
The sum of the numbers 1 to 60 = 60 x 61 ÷ 2 = 1830
Therefore the sum of the numbers 40 to 60 = 1830 - 780 = 1050
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-1540
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
The number halfway between 40 and 60 is the average of the two numbers. To find the average, you add the two numbers together and divide by 2. In this case, (40 + 60) / 2 = 50. Therefore, 50 is the number that is halfway between 40 and 60.
There are infinitely many different choices of 3 numbers that add up to 81. 50 + 30 + 1 = 81 40 + 40 + 1 = 81 10 + 11 + 60 = 81 etc.
Round each of the numbers then add the rounded numbers. 60+40=100.