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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.

 Sep 3, 2021
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25  x  10 ==250 sum of all girls'ages.

 

New girl's age ==12 4/12==12 1/3 years.

 

250  +  12 1/3 ==262 1/3 - sum of the 26 girls' ages.

 

[262 1/3] / 26 ==10.1 - years - new average of the 26 girls.

 Sep 3, 2021

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