(Choose 1 answer)
(See picture)
A. 13.68
B. 12.67
C. 10.09
D. 11.90
Suppose that the number of cars X that pass through a car wash between 4:00 PM and 5:00PM on any sunny Friday has the following probabil-ity distribution:
X 4 5 6 7 8 9
P(X=x) 1/12 1/12 1/4 1/4 1/6 1/6
Let Y = 2X-1 represent the amount of money in dollars, paid to the attendant by the man-ager. Find the attendants' expected earnings for this particular time period.
