10 customers ordered pizza. Five ordered 1 pizza, two ordered 2 pizzas, two ordered 3 pizzas, and one ordered 4 pizzas. What's the mean number of pizzas ordered for this discrete distribution?
A. 2.5
B. 2.25
C. 1.25
D. 1.9
2. When people attend a fundraiser, 40% of them donate money. If three people attend this month’s fundraiser -- Jane, Kate, and Liza -- what are the exact chances that just one of them will donate money?
A. 43.20%
B. 14.40%
C. 28.80%
D. 9.60%
3. Suppose you have two normal curves. Both curves are equally tall but one is to the right of the other one. It is likely that the curve to right has a _____.
A. greater mean
B. smaller mean
C. greater standard deviation
D. smaller standard deviation
