Suppose Johnson? & Johnson and Walgreen Boots Alliance have expected returns and volatilities shown here, with a correlation of 24%. Calculate
a. the expected return and
b. the volatility(standard deviation) of a portfolio that consists of a long position of $8,500 in Johnson & Johnson and a short position of $1,000 in Walgreens.
Expected Return Standard Deviation
Johnson & Johnson 7.2% 15.1%
Walgreens 9.1% 20.8%