Probability Review

Which of the following probabilities means that the event is most likely to occur?

• 4/6

• 0.55

• 62%

• 0.31

Which of the following could not be the probability of an event?

• 0.26

• 0

• 0.94

• 1.25

You roll a die and want to get an even number. What is the sample space?

• S={1,2,3,4,5,6,7,8,9,10}

• S={1,2,3}

• S={1,2,3,4,5,6}

• S={2,4,6}

You roll a die and want to get an even number. What is the event?

• E={1,2,3,4,5,6,7,8,9,10}

• E={1,2,3}

• E={1,2,3,4,5,6}

• E={2,4,6}

You draw a random card from the deck. What is the probability of drawing a face card? (Remember, a face card is a Jack, Queen, or King.)

• 23.1%

• 33.3%

• 68.2%

• 80%

I ran an experiment where I kept track of how many people were wearing different colored shirts. Based on the experiment results in the table, what is the probability that a randomly selected person is wearing a green shirt?

• 10.6%

• 34.8%

• 56.7%

• 85.1%

You draw a random card from a deck. What is the probability of drawing a black card or a 9?

• 4/26

• 9/52

• 28/52

• 30/52

Suppose that the probability of event A is P(A)=0.4, the probability of event B is P(B)=0.6, and the probability of A and B is P(A ∩ B)=0.2. Use the addition rule to determine P(A ∪ B).

• 0.2

• 0.5

• 0.8

• 1

If you roll a die, what is the probability of rolling a number that is odd and greater than 2?

• 3%

• 3.33%

• 13%

• 33.3%

If the sample space is S={1,2,3,4,5,6,7,8,9,10} and the event is E={1,4,9}, what is P(E)?

• 10%

• 30%

• 40%

• 90%