1) You have a sample of 9 flowers from pea plants.

(a) Suppose 6 of them are white, and 3 of them are purple. If you line them up in a row, how many different arrangements can you get? Note: WWWWWWPPP is one arrangement, WPWPWWWPW is another arrangement, and so on.

(b) Now suppose 3 of them are white and 6 of them are purple. How many different arrangements can you get? Does this make sense?

(c) How many arrangements do you have for 1 white and 8 purple?

(d) How many arrangements do you have for 0 white and 9 purple?

2) In the U.S., about 6.6% of people are O for blood type. You take a sample of size 8. You're interested in people who are O. Figure out the following probabilities:

a)Pr{Y= 3} b)Pr{Y= 1} c)Pr{Y< 1} d)Pr{Y> 0}