Qwizdom - Maths Probability
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This document contains examples of probability questions and calculations. It provides probabilities for different scenarios involving colors drawn from a bag, dice rolls, coin flips, and combined probabilities of independent events. The questions test understanding of basic probability concepts like possible range of probabilities, missing values, conditional probabilities, and calculating expected values.
Qwizdom - Maths Probability
- 1. Probability
- 2. Probabilities are always between 1 and 100 True or False
- 3. Which of these probabilities is not possible? A ¾ B 0.5 C -1 D 73%
- 4. What is the missing value? A 1 in 12 B 1/12 C 1 out of 12 D 1:12 Colour Red Blue Green Yellow Prob. 5/12 1/12 5/12
- 5. What is the missing value? Colour Red Blue Green Yellow Prob. 0.4 0.16 0.25
- 6. What is the missing value? What is the probability of getting Yellow or Blue? Colour Red Blue Green Yellow Prob. 0.4 0.16 0.25
- 7. What is the missing value? A 1/10 B 1/2 C 1/5 D 9/20 Colour Red Blue Green Yellow Prob. 7/20 3/10 1/4
- 8. If the probability of it raining tomorrow is 0.56, what is the probability of it not raining?
- 9. If I throw a dice 300 times, how many times would I expect to get a “2”
- 10. I flip a biased coin 20 times and get 14 heads. How many heads would I expect to get if I threw it 60 times?
- 11. The probability of Sharon buying a magazine is 0.4 and the probability of buying a book is 0.2. What is the probability that Sharon buys both?
- 12. The probability of choosing a red counter out of a bag is 4/7 and the probability of choosing a green counter is 2/5. What is the probability of choosing a red counter, replacing it, and then choosing a green counter? A 8/35 B 6/12 C 34/35
- 13. Red Blue 0.8 0.2 What is the missing value? 0.7 ?
- 14. Red Blue 0.8 0.2 What are the missing letters? A RB B BR C BB 0.7 0.3 0.7 0.3 Red Red Blue Blue P(RR) P(??)
- 15. Red Blue 0.8 0.2 What is P(RR)? 0.7 0.3 0.7 0.3 Red Red Blue Blue P(RR) P(RB) P(BR) P(BB)
- 16. Red Blue 0.8 0.2 What is the probability of getting a Red followed by a Blue? 0.7 0.3 0.7 0.3 Red Red Blue Blue P(RR) P(RB) P(BR) P(BB) 0.56
- 17. Red Blue 0.8 0.2 What is the probability of getting 2 the same colour? 0.7 0.3 0.7 0.3 Red Red Blue Blue P(RR) P(RB) P(BR) P(BB) 0.56 0.24
- 18. Red Blue 0.8 0.2 What is the probability of getting at least 1 Red? 0.7 0.3 0.7 0.3 Red Red Blue Blue P(RR) P(RB) P(BR) P(BB) 0.56