1.

When quartile is a fraction Let us colculate Q_(1) from the following array.

Answer»

SOLUTION :
`Q_(1)=(N+1)/(4)"th ITEM" =(20+1)/(4)"th item"=5.25"th item"`
Value of 5th item = Rs. 66
Value of 6th item = Rs. 68
DIFFERENCE = Rs. 2 `(=68-66).`
`thereforeQ_(1)=66+(25xx2)=66+0.5=66.5`


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