8.2.1: Mutually Exclusive Events and the Addition Rule (Exercises)
SECTION 8.2 PROBLEM SET: MUTUALLY EXCLUSIVE EVENTS AND THE ADDITION RULE
Determine whether the following pair of events are mutually exclusive.
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1) A = {A person earns more than $25,000} B = {A person earns less than $20,000} |
2) A card is drawn from a deck. C = {It is a King} D = {It is a heart}. |
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3) A die is rolled. E = {An even number shows} F = {A number greater than 3 shows} |
4) Two dice are rolled. G = {The sum of dice is 8} H = {One die shows a 6} |
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5) Three coins are tossed. I = {Two heads come up} J = {At least one tail comes up} |
6) A family has three children. K = {First born is a boy} L = {The family has children of both sexes} |
Use the Addition Rule to find the following probabilities.
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7) A card is drawn from a deck. Events C and D are: C = {It is a king} D = {It is a heart} Find P(C or D). |
8) A die is rolled. The events E and F are: E = {An even number shows} F = {A number greater than 3 shows} Find P(E or F). |
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9) Two dice are rolled. Events G and H are: G = {The sum of dice is 8} H ={Exactly one die shows a 6} Find P(G or H). |
10) Three coins are tossed. Events I and J are: I = {Two heads come up} J = {At least one tail comes up} Find P(I or J). |
| 11) At a college, 20% of the students take Finite Mathematics, 30% take Statistics and 10% take both. What percent of students take Finite Mathematics or Statistics? | 12) This quarter, there is a 50% chance that Jason will pass Accounting, a 60% chance that he will pass English, and 80% chance that he will pass at least one of these two courses. What is the probability that he will pass both Accounting and English? |
Questions 13 - 20 refer to the following: The table shows the distribution of Democratic and Republican U.S by gender in the 114 th Congress as of January 2015.
| MALE(M) | FEMALE(F) | TOTAL | |
| DEMOCRATS (D) | 30 | 14 | 44 |
| REPUBLICANS(R) | 48 | 6 | 54 |
| OTHER (T) | 2 | 0 | 2 |
| TOTALS | 80 | 20 | 100 |
Use this table to determine the following probabilities.
| 13) P(M and D) | 14) P(F and R) |
| 15) P(M or D) | 16) P(F or R) |
| 17) P(Mc or R) | 18) P(M or F) |
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19) Are the events F, R mutually exclusive?
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20) Are the events F, T mutually exclusive?
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SECTION 8.2 PROBLEM SET: MUTUALLY EXCLUSIVE EVENTS AND THE ADDITION RULE
Use the Addition Rule to find the following probabilities.
| 21) If P(E) = .5 , P(F) = .4 , E and F are mutually exclusive, find P(E and F). | 22) If P(E) = .4 , P(F) = .2 , E and F are mutually exclusive, find P(E or F). |
| 23) If P(E) = .3, P(E or F) = .6 , P(E and F) = .2, find P(F). | 24) If P(E) = .4, P(F) = .5 , P(E or F) = .7, find P(E and F). |
| 25) In a box of assorted cookies, 36% of cookies contain chocolate and 12% of cookies contain nuts. 8% of cookies have both chocolats and nuts. Sean is allergic to chocolate and nuts. Find the probability that a cookie has chocolate chips or nuts (he can’t eat it). |
26) At a college, 72% of courses have final exams and 46% of courses require research papers.
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Questions 25 and 26 are adapted from Introductory Statistics from OpenStax under a creative Commons Attribution 3.0 Unported License, available for download free atcnx.org/content/col11562/latest u