Mail rooms contaminated with anthrax. In Chance (Spring 2002), research statisticians discussed the problem of sampling mail rooms for the presence of anthrax spores.

Let x equal the number of mail rooms contaminated with anthrax spores in a random sample of 3 mail rooms selected from a population of 100 mail rooms. If 20 of the 100 mail rooms are contaminated with anthrax, researchers showed that the probability distribution for x is given by the formula

a. What is the name given to this probability distribution?

b. Specify r, N, and n for this distribution.

c. Find p102.

d. Find p112.

e. Find p122.

f. Find p132.

Transcribed Image Text:

20 (29) 80 P(x) = (+) (50) 3 x (199)