What is the mean of 30, 35, 35, 35, 40, 40, 45, 45, 45, 45, 50, 50, 50, 55, 55, and 60?
The sum of the numbers divided by the number of numbers = mean
Sum=715
16 numbers
$${\frac{{\mathtt{715}}}{{\mathtt{16}}}} = {\mathtt{44.687\: \!5}}$$
It is the eighth number 45