The beta for stock A if the covariance between stock a and the market is 1.5 and the variance of the market is 2.5 is 0.6.
Compared to the market as a whole, a security's or portfolio's beta () represents how volatile or systematic risky it is (usually the S&P 500). A stock is considered to be more volatile than the S&P 500 if its beta is higher than 1.0.
The capital asset pricing model (CAPM), which explains how systematic risk and expected return on assets relate to one another, uses beta (usually stocks). Taking into account both the risk of the assets and the cost of capital, the CAPM is a frequently used method for pricing hazardous securities and for estimating projected returns on investments.
Rationale:
1.5/2.5 = 0.6.
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