Question

the average age of class of 20 children is 12.6,if new 5 children joined with an average age 12.2 then find new average of class

Answer 1

Students = 20
Mean = 12.6
Total age of class = 12.6 x 20
= 252
Age of 5 more students
= 12.2 x 5
= 61
Total students = 25
Total age = 252 + 61 = 313
New mean of class = 313/25 = 12.52 years

Answer 2

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