UPSC NDA Math Model Paper 2

Given: For some observations we have mean and coefficient of variation as 15 and 48 respectively.
Here, we have to find the standard deviation for the same observations.
Let the standard deviation be x
As we know, Coefficient of variation =

standard deviaiton

Mean

×100
⇒ Coefficient of variation =

x

15

×100=48
⇒x=

48×15

100

⇒x=7.2
Hence, option C is the correct answer.