Question

the mean of 100 observations is 24 if 4 is added to each of observation then each of them is multiplied by 2.5 the new mean is​

Answer 1

Step-by-step explanation:

if 6 is added to each observations

The new mean will be 24+6= 30

If 2.5 is multiplied to each item

The mean will be 2.5 × 30 =75

Answer 2

The arthmetical means=sum of all observations /number of observation

hence sum of all observations= 24*100=2400

Now 6 is added to each of the observations, so the sum would be 2400+ 100*6 = 3000

And each of them is multipled by 2.5

so the new sums of observations = 3000*2.5=7500

Hence mean = 7500/100=75

Hope my answer will help you