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Suppose the values x1, x2,…..xn having f...

Suppose the values `x_1, x_2,…..x_n` having frequency `f_1, f_2…...f_n` respectively have mean value `overset- x` and variation `sigma^2` .Let a be a fixed real number. Show that the values `x_1+a,x_2+a,….,x_n+a` with frequency `f_1,f_2….f_n` respectively will have mean value `overset-x+a` and variance `sigma`

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