The mean age of members of a class was 71.9. The next year the mean age was 71.5 years. How can the me?

Question

The mean age of members of a class was 71.9. The next year the mean age was 71.5 years. How can the me?

Answer 1

The class with the mean age of 71.9 graduated from that class.

The next year, the new students who came to the class had a mean age of 71.5.

Answer 2

mean is not average...check out the difference.

Answer 3

It's an old class - their average age is over 70, but this year it's a little younger.

Answer 4

Someone died.