Question 28

waecmaths question: 

The average age of a group of 25 girls is 10 years. If one girl aged 12 years and 4 months joins the group, find, correct to one decimal place, the new average age of the group.

Option A: 

10.1 years

Option B: 

9.3 years

Option C: 

8.7 years

Option D: 

8.3 years

waecmaths solution: 

Total age of the 25 girls is 250 years

The girls age who was later added to the group is 12 years and 4 months, that is 12.33 years

Total ages of the girls = 250 + 12.33 = 262.33

The new average will be (262.33) ÷ 26 =10.1 to 1 decimal place

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