How to calculate the stock beta?

How to solve this question:
The total risk of Stock Y is 0.2, the total risk of the index is .18. The covariance of returns between the stock and index is .27, what is the stock’s beta?

1 Answer(s)


Stock beta= Covariance/ Variance of index.
= answer.

Note that the Covariance value should be .027. And answer will come as 0.83333
Also total risk means standard deviation.