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kvv77 [185]
3 years ago
6

Please help on this math problem. :))​

Mathematics
2 answers:
ratelena [41]3 years ago
7 0

Answer:

15.23

Step-by-step 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.

\frac{868}{7+12+18+9+5+4+2} \\ \\ \frac{868}{57} \\ \\ 15.23

vlada-n [284]3 years ago
3 0

Answer:

Step-by-step 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                        <u> 2                             38</u>

Totals                 57                            868

The mean is the total number of years / total frequency

mean = 868/57

mean = 15.23

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