Suppose, at a local movie theater, the amount of money that a man spends at the concession has an average of 28 dollars and a standard deviation of 7.0 dollars. As well, the amount of money that a woman spends at the concession has an average of 15 dollars and a standard deviation of 2.5 dollars.

(a) What is the expected difference in the amount spent by a man and a woman at the concession?

Answer:

(b) What is the standard deviation for this difference? (Round your answers to four decimal places, if needed.)

Answer:

(c) What is the expected total amount spent by a man and a woman at the concession?

Answer:

(d)What is the standard deviation for this total amount? (Round your answers to four decimal places, if needed.)

Answer: