probability unit test answers unit 8 lesson 9
1. What is the probability of rolling a 5 on a standard six-sided die?
Answer: 1/6
2. If you flip a coin, what is the probability of getting heads?
Answer: 1/2
3. A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. What is the probability of picking a blue marble at random?
Answer: 3/10
4. If you roll a pair of dice, what is the probability of rolling a sum of 7?
Answer: 6/36 or 1/6
5. A box contains 10 red balls, 5 blue balls, and 3 green balls. What is the probability of randomly selecting a red or blue ball?
Answer: (10 + 5)/18 or 15/18 or 5/6
6. If you draw a card from a standard deck of 52 cards, what is the probability of drawing a heart or a club?
Answer: 26/52 or 1/2
7. A jar contains 24 red candies, 16 blue candies, and 8 yellow candies. What is the probability of randomly selecting a blue or yellow candy?
Answer: (16 + 8)/48 or 24/48 or 1/2
8. If you spin a spinner with 8 equal sectors numbered 1 through 8, what is the probability of landing on an even number?
Answer: 4/8 or 1/2
9. A bag contains 3 white balls and 7 black balls. If you randomly select 2 balls without replacement, what is the probability of selecting 2 black balls?
Answer: (7/10) * (6/9) = 42/90 or 7/15
10. If you roll a fair 8-sided die, what is the probability of rolling an odd number less than 5?
Answer: 2/8 or 1/4