You own a portfolio that has $3,500 invested in Stock A and $4,500 invested in Stock B. If the expected returns on these stocks are 11 percent and 14 percent, respectively, what is the expected return on the portfolio

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends > a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?