Question

The mean of 15observations is 20 if 8 is added to each observation, find the new mean

Answer 1

The new mean is equal to 28.

• The mean of 15 observations is given as 20.

• Now each observation is added by 8 and the new mean is calculated, for this we use the properties of mean.

• The property states that if each observation in the data is added by a constant k then the mean of the new data also gets added by k.

• Therefore the new mean will be original mean added by 8 that is 20+8 = 28.