Question

the average age of 15 boys is 10. if the average age of first 14 boys is 9 then what will be age of 15th boy?​

Answer 1

Answer:

Step-by-step explanation:

Average ages of 15 boys=10

Sum of observations =Average*No. of observations

=10*15

=150

Average ages of first 14 boys=9

Sum of observations =Average*No. of observations

=9*14

=126

Age of 15th boy =150-126

                          =24 years