Jennie charges $200 per passenger for a sunset sailing tour on her catamaran, while Paul charges $250 per passenger. We can define the amount of money each person earns per cruise as a random variable.
Let A = the amount of money Jennie earns and let B = the amount of money Paul earns.
A = 200X and B = 250Y
Mu Subscript A = $730, Sigma Subscript A = $192.62
Mu Subscript B = $962.5, Sigma Subscript B = $253.425
What is the standard deviation of the difference of the amount of money that Jennie and Paul earn on a randomly selected cruise?