Question

6. If Arithmetic Mean and coefficient of variation of x are 5 and 20 respectively. What is the variance
of (15-2x)?
(a) 16
(b) 2
(c) 4
(d) 32​

Answer 1

Answer:

It's easy .

First find out the sd of X.

see,

Coefficient of variation= SD/Mean*100%

=> SD= Mean*COV = 10*40%=4

=>Variable (X)=16

Variable (15-2X)=4*Variable(X)=4*16=64

Note:If the CoV is not given in percentage plz adjust accordingly

Please:

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