Conditional Probability

A coin is tossed and then a regular 6-sided die is rolled. What is the probability of the resulting outcome being

(tails, even)?

• 1/2

• 1/12

• 1/6

• 1/4

Sarah, Sammie, Victor, Vicki, and Valerie are in math group. Two students are randomly picked to be the co-leaders. What is the probability that the students picked were Sammie and Victor?

• 1/25

• 2/5

• 1/5

• 1/20

Sarah, Sammie, Victor, Vicki, Valerie are in a math group. Two students are randomly chosen to be co-leaders. What is the probability that both students' names begin with the letter V?

• 3/5 times 3/5 = 9/25

• 3/5 times 1/2 = 3/10

• 1/5 times 2/5 = 2/15

• 3/5 times 1/4 = 3/20

If you draw out a red marble, keep it, then draw out a blue marble, is it independent or dependent probability?

• Independent

• Dependent

P( Sports Car | male)

Mathematical Equivalence

OFF

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

Mathematical Equivalence

ON

P(C | B)

Mathematical Equivalence

ON

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

Mathematical Equivalence

ON

Pr(Sports | Men) =

Mathematical Equivalence

OFF

What is the probability of picking a green marble, keeping it, then picking another green marble? (leave answer in fraction form in lowest terms)

• 9/49

• 1/7

• 3/14

• 6/42