Question

What age was the mean of all the guesses (rounded to the nearest whole number)? 57 59 63 68 74?

Answer 1

The answer is 64, rounded from 64.2.

To get this, you just have to add all the numbers up, and then divide your answer by the amount of numbers you added (just for future reference in problems like these!).  To round to the nearest whole number, you look at the decimal: .2.  It's closer to 0 than it is to 10, so the 64.2 would round down to 64.

I hope this helps!