Answer:
His portfolio's expected return and standard deviation are 8.7% and 6%, respectively.
Explanation:
portfolio's expected return = (amount invested in risky asset x expected rate of return) + (amount invested in T-bills x expected return) = (30% x 0.15) + (70% x 0.06) = 4.5% + 4.2% = 8.7%
standard deviation = amount invested in risky asset x √variance = 30% x √0.04 = 30% x 0.2 = 6%