Conditional Probability from Two-Way Tables

The two-way table above gives information about the grades for the semester in Mrs. Hardcase’s English class.

1) What is the probability a randomly selected student got an A or B for the semester?

• 15/100

• 20/100

• 35/100

• 65/100

The two-way table above gives information about the grades for the semester in Mrs. Hardcase’s English class.

2) What is the probability a randomly selected student is male?

• 12/100

• 17/100

• 44/100

• 56/100

The two-way table above gives information about the grades for the semester in Mrs. Hardcase’s English class.

3) What is the probability a randomly selected student earned a passing grade?

• 20/100

• 35/100

• 65/100

• 87/100

The two-way table above gives information about the grades for the semester in Mrs. Hardcase’s English class.

4) Given that the grade is an A, what is the probability of the student being female?

• 8/20

• 12/20

• 8/44

• 12/56

The two-way table above gives information about the grades for the semester in Mrs. Hardcase’s English class.

5) Given that the grade is a B, what is the probability of the student being male?

• 6/15

• 9/15

• 6/56

• 9/44

The make-up of employees at a police station is shown in the table above:

6) What is the probability that a randomly selected employee is a chief?

• 1/100

• 2/100

• 1/33

• 1/67

The make-up of employees at a police station is shown in the table above:

7) What is the probability that a randomly selected employee is male and a sergeant?

• 8/13

• 8/33

• 8/67

• 8/100

The make-up of employees at a police station is shown in the table above:

8) Given the employee is a chief, what is the probability the employee is male?

• 1/100

• 1/33

• 1/2

• 1/67

The make-up of employees at a police station is shown in the table above:

9) Given the employee is a female, what is the probability of the employee being a chief?

• 1/2

• 1/33

• 1/67

• 1/100

The make-up of employees at a police station is shown in the table above:

10) Given the employee is an inspector, what is the probability the employee is male?

• 2/6

• 2/33

• 2/67

• 2/100