MATH 170 - Applied Statistics
Quiz 7 - Probability
Friday, October 27, 2006
Name:
1. Suppose 200 people at WCU volunteered to donate blood when the Red Cross came to campus for a blood
drive. Before you can donate blood you must pass the screening. The table below shows the number of
men and women that volunteered and how many did or didn’t pass their screening.
Passed Failed
Screening Screening
Men 71 14
Women 89 26
If a volunteer is selected at random, find the following probabilities:
(a) [1 point] P(the volunteer failed the screening) =
(b) [1 point] P(the volunteer was NOT a woman) =
(c) [1 point] P(the volunteer was a man AND passed the screening) =
(d) [1 point] P(the volunteer failed the screening OR was a man) =
(e) [1 point] P(the volunteer passed the screening GIVEN she was a woman) = P(passed |woman) =
(f) [1 point] P(the volunteer was a woman GIVEN they passed the screening) = P(woman |passed) =
2. [4 points] Shade the region of the Venn diagram corresponding to each of the events below:
(a) (B and C )or C (b) C or (notB)
