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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.

 Mar 1, 2021
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12yrs, 4 mths  =   12 + 1/3  yrs    =   37/3  yrs

 

 

25 (10)  +  37/3               787/3

_____________   =       ______  ≈   10.1  yrs  =  new avg age

         26                             26

 

 

 

cool cool cool

 Mar 1, 2021

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