Brook’s Café sells slices of 7 layer chocolate cake. A slice of cake sells for $7 and costs the café $3 per slice. In order to eliminate waste, the café discounts slices of cake to $2 after regular hours (4:00pm) and is able to sell all remaining cake. Canyon Café estimates the demand for chocolate cake during regular hours to be Poisson distributed with a mean of 8 slices per day. What is the optimum quantity of slices Brook’s Café should purchase per day? a) 8 b) 9 c) 10 d) Cannot be determined without the standard deviation.