Question

the average age of 15 students is 16.5 and the years and the average age of 5 is 4.5. Calculate the average age of the whole group

Answer 1

Answer:

13.5

Step-by-step explanation:

Average of 15 students =16.5

Average of 5 students =4.5

Calculate the average of the whole group=X

Total Age of 15 students =15×16.5=247.5

Total Age of 5 students= 5×4.5=22.5

Average of whole group =(247.5+22.5)÷20

=270÷20

=13.5