Question

The sum of the revolutions of N observations from 25 is 25 and sum of their new version of the same in observation questions from 35 - 25 find mean of the observations observations

Answer 1

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Let 'n' be the required number of observations

Therefore,

∑(Xi - 25) = 25

∑ Xi - 25n = 25 .....(i)

Similarly,

∑(Xi - 35)= -25

∑ Xi - 35n = -25......(ii)

On subtracting the both

∑ Xi - 25n = 25

∑ Xi - 35n = -25

(-) (+) (+)

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10n = 50

n = 5

Putting n in (i)We get,

∑of Xi - 25(5) = 25

∑ Xi - 125 = 25

∑ of Xi = 150

Now mean is given by

x= ∑ Xi / n = 150/5 = 30 (Ans)

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