The mean age of 5 people in a room is 30 years. A 36 year old person walks in. What is now the mean age of the people in the room?

1 Answer
Bill K.
Feb 2, 2016

31 years

Explanation:

Since 5 people have a mean age of 30, the sum of their ages is #5 * 30 = 150#. Adding one more person of age 36 to the group gives 6 people with sum of ages #150+36=186#. Now divide this by 6 to get the new mean for the group of 6 people: #186/6=31# years.

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