Anita has two sisters and three brothers. The mean of all their ages is 6 years. Wht is the mean of their agesin 10 years and 20 years?

Answer 1

mean =∑x/n

6 = ∑x/6

∑x = 36

In 10 years ∑x = 36 + 6(10)

In 20 years ∑x = 36 + 6(20)

I'll let you do the calculations.