Question

The mean of 12 observations is 15,if 4 is added to each observation then new mean is​

Answer 1

Given :-

The mean of 12 observation is 15

Solution :-

Given mean of 12 observations is 15

Therefore,

The sum 12 of observations = 12 * 15 = 180

Now,

If each observation is added by 4

Then ,

The no. of observation is added by 4

= 12 * 4 = 48

Now ,

The sum of observation added by 48

180 + 48 = 228

Now,

The mean of the new observation

= 228/ 12 = 19

Hence, The mean of the new observation is 19 $.$