What is the probability of selecting a finance or


1. A sample of 2000 licensed drivers revealed the following number of speeding violations.

Number of Violations       Number of Drivers

0                   1910

1                   46            

2                   18

3                   12

4                   9

5 or more                5

Total                 2000

a) What is the experiment?

b) List the possible event.

c) What is the probability that a particular driver had exactly two violations?

d) What concept of probability does this illustrate?

2. The events X and Y are mutually exclusive. Suppose P(X) = .05 and P(Y) = .02. What is the probability of either X or Y occurring?  What is the probability that neither X nor Y will happen?

3. A student is taking two courses, history and math.  The probability the student will pass the history course is .60, and the probability of passing the math course is .70.  The probability of passing both is .50.  What is the probability of passing at least one?

4. Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 non-defective ones.

a) What is the probability the first two electric toothbrushes sold will be returned to the drugstore because they are defective?

b) What is the probability the first two electric toothbrushes sold will not be defective?

5. Berdines Chicken Factory has several retail stores. When interviewing applicants for server positions, the owner would like to include information on the amount of tip a server can expect to earn per check (or bill). A study of 500 recent checks indicated the server earned the following tips.

Amount of Tip ($)            Number

$0 to under $5             200

5 to under 10              100

10 to under 20             75

20 to under 50             75

50 or more             50

Total                 500

a) What is the probability of a tip of $50 or more?

b) Are the categories "$0 to under $5", "5 to under 10", and so on considered mutually exclusive?

c) If the probabilities associated with each outcome were totaled, what would the total be?

d) What is the probability of a tip of up to $10?

e) What is the probability of a tip of less than $50?

6. A survey of Undergraduate Students in the School of Business at Northern University revealed the following regarding the gender and majors of students:

Major

Gender       Accounting     Marketing Finance  Total

Male         100       150    50    300

Female        100       50    50    200

Total        200       200    100    500

a) What is the probability of selecting a female student?

b) What is the probability of selecting a finance or accounting major?

c) What is the probability of selecting a female or an accounting major? Which rule of addition did you apply?

d) What is the probability of selecting an accounting major, given that the person selected is male?

e) Suppose two students are selected randomly to attend a lunch with the president of the university.  What is the probability that both of those selected are accounting majors?

7.

a) Some Saskatchewan license plates have three letters and three numbers. How many license plates of this type can there be?

b) Some Ontario license plates have four letters and three numbers.  How many license plates of this type can there be?

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