Question

Please help on this math problem. :))​

Answer 1

`15.23`

Explanation:

First, we can make an equation by adding all the ages together and dividing it by the sum of the frequencies.

`(13*7)+(14*12)+(15*18)+(16*9)+(17*5)+(18*4)+(19*2)`

Now simplify.

`(13*7)+(14*12)+(15*18)+(16*9)+(17*5)+(18*4)+(19*2) = 868`

We can divide this number by the sum of the frequencies.

`(868)/(7+12+18+9+5+4+2) \\ \\ (868)/(57) \\ \\ 15.23`

Answer 2

Explanation:

First you need to find the total number of years of all the people tracked.

The general formula is

Total years = age*frequency for all ages.

Age Frequency Total

13 7 91

14 12 168

15 18 270

16 9 144

17 5 85

18 4 72

19 2 38

Totals 57 868

The mean is the total number of years / total frequency

mean = 868/57

mean = 15.23