From the prices of shares X and Y below, find out which is more stable in value:

Here

For X

Mean where n is number of terms

=

=

=

Standard deviation = √variance= √35=5.91

Coefficient of variation

For Y

where n is number of terms

=

=

=

=

Standard variance = √variance= √4=2

Coefficient of variation

Covariance of x covariance of Y

⇒ X is more variable and Y is more stable than X