Probability - take the quiz
5. Which of these events has a higher probability of occurring?
Flipping heads twice in a row
Rolling two even numbers with two dice
Drawing two cards from a deck and getting both aces
The probability of drawing two aces from a deck is (4/52) x (3/51) = 1/221.
6. If you flip a coin three times, what is the probability of getting at least one tails?
1/8
3/8
5/8
7/8
7. A bag contains 10 red marbles and 5 blue marbles. If you draw one marble at random, what is the probability that it will be red?
1/2
2/3
3/5
4/7
8. If you roll two dice, what is the probability that the sum of the numbers rolled will be 7?
1/6
1/5
1/4
1/3
9. Which of these events is more likely to occur?
Rolling a 3 on a standard six-sided dice
Flipping tails twice in a row
Drawing a spade from a deck of cards
The probability of drawing a spade from a deck of cards is 13/52 = 1/4.
10. What is the probability of getting a full house (three of a kind and a pair) in a five-card poker hand?
1/50
1/100
1/500
1/1000
If you draw two cards from a deck without replacement, what is the probability that both cards will be black?
1/13
1/26
1/52
25/102
After that, there are 25 black cards left in the deck out of 51 total cards, so the probability of drawing another black card is 25/51. Multiplying these probabilities together gives 25/102.
12. Which of these events has a lower probability of occurring?
Rolling a pair of sixes with two dice
Drawing a straight flush in poker
Flipping heads ten times in a row
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