Question 65 with proper explanation

Gopal Garg

What is the answer of 66,?

Doonika Chunduri

Is it from MTP? I need the solution too...

Doonika Chunduri

Is it from MTP? I need the solution too...

Thread Starter

Can u solve 65??

Sudha Reddy

Try taking number of girls and boys be 'x' and '2x' Sum of height of girls = 162x and Sum of height of boys = 364x Mean of whole class = (Sum of height of girls + Sum of height of boys)/ (No. of girls + No. of boys) =(162x+364x) / (x+2x)

Sudha Reddy

Try taking number of girls and boys be 'x' and '2x' Sum of height of girls = 162x and Sum of height of boys = 364x Mean of whole class = (Sum of height of girls + Sum of height of boys)/ (No. of girls + No. of boys) =(162x+364x) / (x+2x)

Doonika Chunduri

Sir I'm getting 175.333..

Thread Starter

Me too but what is the ans

Doonika Chunduri

Sir I'm getting 175.333..

Sudha Reddy

option D

Doonika Chunduri

Thank you sir

Thread Starter

Can u post the solution here

Doonika Chunduri

.

Doonika Chunduri

How'd you get 1.5 in 66th question?

Thread Starter

Since y=3 find x ...keep x on LHS x=3-2y/4 now here quartile deviation is not affected by change of origin so x=2y/4 or 6/4 or 3/2 is 1.5