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Answer 1

Answer:

The deviations of x1,x2,...,xn from 50 ,x2 -50,....xn-50

hence this sum is

(x1-50) + (x2-50) +........(xn-50)= -10

(x1+x2........xn) -50n= -10 :- (1)

similarly we have

(x1 + x2 + ........ xn) - 46 n =70....(2)

equation 1 - 2 gives

-4n= - 80

n=20

substituting the values of n in n ..(1)

(x1 + x2 + .....xn) -50(20) = - 10

(x1 + x2 +.....xn)=990

hence the mean

(x1 + x2 +....xn) /n=990/20=49.5

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Answer 2

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