Question

3. The ages of three sisters are 12 years,15 years and
18 years. Find their average age.

and what will be
average age after 3 years
​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

15, 18

Step-by-step explanation:

Their avg. age = Sum of observations / No. of observations = 12+15+18/3 = 45/3 = 15

After 3 yrs, Age of 1st sister = 12+3=15

Age of 2nd sister = 15+3=18

Age of 3rd sister = 18+3=21

Now, avg. = Sum of observations / No. of observations = 15+18+21/3= 54/3= 18