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 _____.
