A teenager is someone who is 13, 14, 15, 16, 17, 18 or 19 years old. The product of the ages of a particular group of teenagers is 705,600. What is the mean of their ages in years? Express your answer as a decimal to the nearest tenth.
A teenager is someone who is 13, 14, 15, 16, 17, 18 or 19 years old. The product of the ages of a particular group of teenagers is 705,600. What is the mean of their ages in years? Express your answer as a decimal to the nearest tenth.
I could find only one way to produce a product of 705,600 by
using only "teen" numbers – namely, 14 • 14 • 15 • 15 • 16
so there are five teenagers in the group, with those ages.
74
The mean (average) of those five numbers is —— = 14.8
5
.
