Sales of hair dryers at the walgreens stores in youngstown, ohio, over the past 4 months have been 100, 110, 120, and 130 units (with 130 beging the most recent sales). develop a moving-average forecast for next month, using these techniques: (a) 3-month moving average. (b) 4-month moving average. (c) weighted 4-month moving average with most recent month weighted 1 0.4, the preceding month weighted 0.3, then 0.2, and the oldest month weighted 0.1. (d)

Stocks a, b, and c are similar in some respects: each has an expected return of 10% and a standard deviation of 25%. stocks a and b have returns that are independent of one another; i.e., their correlation coefficient, r, equals zero. stocks a and c have returns that are negatively correlated with one another; i.e., r is less than 0. portfolio ab is a portfolio with half of its money invested in stock a and half in stock b. portfolio ac is a portfolio with half of its money invested in stock a and half invested in stock c. which of the following statements is correct? a. portfolio ab has a standard deviation that is greater than 25%.b. portfolio ac has an expected return that is less than 10%.c. portfolio ac has a standard deviation that is less than 25%.d. portfolio ab has a standard deviation that is equal to 25%.e. portfolio ac has an expected return that is greater than 25%.