1.

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Answer» ONG>Answer:

Σ(XI -2)=110

or, Σ(xi) -2n =110

or, Σ(xi ) = 110+2n......(1)

&

Σ(xi -5)=20

or, Σ(xi) -5n =20

Σ(xi ) = 20+5n......(2)

comparing (1) & (2),

110+2n = 20+5n

or, 3n= 90

or, N= 30

from (1) ,

Σ(xi) =110+2*30= 170

mean= (1/n)Σ(xi ) = 170/30 = 17/3


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