Question 75

The average of 21 data is 36 out of which the first 12 data are having an average of 15. The average of the rest 9 data is:

Solution

given that the average of 21 data is 36

$$\frac{\left(sum\ of\ data\right)}{21}$$=36

sum of the data =756

given that the average data of 12 data is 15

i.e;sum of the data= 180

average of rest 9 data is

$$\frac{\left(756-180\right)}{9}$$=64

Share on Whatsapp Share on Whatsapp

Create a FREE account and get: