Probability Rules

Question 1

You roll a 6-side die twice. What is the probability that you get a 5 and then a 2?

Accepted Answer

1/36

Question 2

If you know a person is female, what is the prob. their favorite sport to watch is football?

Accepted Answer

12/73

Question 3

What is the general multiplication rule?

Accepted Answer

P(A and B)=(PA|B)*P(B)

Question 4

P(tall)=0.38 and P(red hair and tall)=0.10. What is P(red hair given tall)?

Accepted Answer

.26

Question 5

You draw two marbles from a bag. You win a prize if you get one of each color. P(winning)=?

Accepted Answer

30/64

Question 6

What's the probability of the union of events "is a male" and "favorite sport is basketball"?

Accepted Answer

131/150

Question 7

P(AUB)=?

Accepted Answer

P(A)+P(B )-P(A and B)

Question 8

89% of the pop. is right-handed. If we pick 3 randomly, what is the prob. that all are righties

Accepted Answer

.705

Question 9

P(A|B) = P(A and B) / x?

Accepted Answer

P(B)

Question 10

How could you pronounce the symbol between A and B?

Accepted Answer

"union" or "or"

Question 11

How could the symbol in between A and B be pronounced?

Accepted Answer

"and" or "intersection"

Question 12

If you roll a 6-sided die, what is the probability that you get a 3 or greater?

Accepted Answer

4/6

Questions 12