Answer:
expected return = (70% x 18%) + (30% x 8%) = 12.6% + 2.4% = 15%
standard deviation of the rate of return = 70% x 28% = 19.6%
Step-by-step explanation:
The expected return for this portfolio is the weighted average of the individual returns.
The standard deviation is the weighted standard deviation of the riskiest investment only.