If each observation of a data is increased by 5, then their mean
Let the observations be x1, x2, x3.........xn
Mean = .....(i)
If each observation is increased by 5, we get,
x1 + 5, x2 + 5, x3 + 5.........xn + 5
New mean
⇒ Mean =
Thus, the mean is also increased by 5.