The mean of 25 observations is 9 . if each observation is increased by 4 then the new mean is _______

Let the 25 observations be x1, x2, x3 , ......, x25.

According to the given condition.

x1+ x2+ x3 +....... + x25 = 25 × 9 = 225

When each observation is increased by 4, then new observation will be,

(x1 + 4), (x2 + 4), (x3 + 4), ......, (x25 + 4).

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