Question

The height of the boys and girls of IX class of a school are given below
Height(cm) 135,140,147,152,155,160
Boys 2,5,12,10,7,1
Girls 1,2,10,5,6,5
Compare the heights of the boys and girls ​

Answer 1

Ans-

The average height of Girls is 2 cm greater than the average height of Boys.

Step-by-step explanation:

Height (cm) 135 , 140, 147, 152 ,155 ,160

Boys , 2 , 5, 12 , 10, 7, 1

Girls 1 , 2, 10, 5, 6, 5

Total number of Boys =2+5+12+10+7+1=37

Sum of heights of all boys =135×2+140×5+147×12+152×10+155×7+160×1=5499

Average height of boys =

5499

-------- = 148.62cm

37

Total number of Girls =1+2+10+5+6+5=29

Sum of heights of all girls =135×1+140×2+147×10+152×5+155×6+160×5=4375

Average height of girls =

4375

--------- = 150.86 cm

29

Hence,

The average height of Girls is 2 cm greater than the average height of Boys.