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
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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
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