(a) Explain the capital asset pricing model (CAPM), its relationship to the security market line, and the major forces causing the security market line to shift.

(b) The possible returns from investing in Academy share are as follows:

State of economy	Probability of state of economy	Return if state occurs
Strong	0.3	34%
Normal	0.4	10%
Weak	0.3	-16%

Based on the above information, calculate the standard deviation of returns and coefficient of variation for Academy share. What does the coefficient of variation reveal about an investments risk that the standard deviation does not?