UPSC NDA Math Model Paper 6

Given: For a data set the coefficient of variation is 60% and standard deviation is 21
Here, we have to find the mean for the same data set.
Let mean be x
As we know, Coefficient of variation =

standard deviaiton

Mean

×100
⇒ Coefficient of variation =

21

x

×100=60
⇒x=

21

60

×100
⇒x=35
Hence, option C is the correct answer.