Question

There are 20 peoples in a singing group. The mean age of 12 of the members is 18years. The mean age of the remaining 8 is 23 years. What is the mean age of the 20 members of the singing group?​

Answer 1

20

Explanation:

The sum of the ages of the first 12 is ...

12×18 = 216

The sum of the ages of the remaining 8 is ...

8×23 = 184

So, the sum of ages of all 20 people is ...

216 +184 = 400

and their average age is ...

400/20 = 20

The mean age of the members of the group is 20.

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The mean of a data set is the total of the values, divided by the number of values.