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The mean age of 5 boys is equal to 9.8. Furthermore, the mean age of 15 girls is 10.2. The mean age of the 20 children together is equal to?

 Mar 8, 2021
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Sum of boys /5   = 9.8               Sum of girls/15 = 10.2

S= 5* 9.8 = 49                         Sg  = 153

 

 

(49 + 153)/  (5+15) = 10.1 years

 Mar 8, 2021

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