What is the mean birth weight of 23 babies

Question

3 babies weigh 4lbs

7 babies weigh 6lbs

13 babies weigh 7lbs

Answer 1

A mean is just an average. Averages are calculated by add all the items then dividing that by the number of items.

For example:

(a+b+c)/3

For your example your formula will look like this:

(4 + 4 + 4 + 6 + 6 + 6 + 6 + 6 + 6 + 6 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7) / 23

Answer 2

Compute the weighted average, which is

[3(4) + 7(6) + 13(7)] / (3 + 7 + 13) lbs = [3(4) + 7(6) + 13(7)] / 23 lbs = ? lbs