Question | Answer |
The relative frequency of someone being a vegetarian is 0.2. If I ask 200 people, how many would I expect to be vegetarian? | 40
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The relative frequency of someone liking Nandos is 75/100. If I ask 500 people, how many would I expect to like Nandos? | 375
| I roll a dice 600 times. I roll a six 200 times. Is this dice fair? Explain your answer. | No because you would expect to roll a six 100 times.
| The probability of Leicester winning the league is 0.7. The probability of Chelsea winning the league is 0.05. What is the probability of Leicester or Chelsea winning the league? | 0.75
| Drawer A contains 7 red socks and 3 black socks.Drawer B contains 4 red socks and 6 black socks.A sock is taken from each drawer.What is the probability of picking a red sock from each drawer? | 0.28
| The probability that Tom is late for school is 0.7. What is the probability that he is on time for school? | 0.3
| What does the notation P(A U B) mean? | The probability of A or B.
| What does the notation P(A') mean? | The probability of A not happening.
| Which part of a venn diagram matches the notation P(A ∩ B)? | The intersection.
| I roll 2 fair dice. What is the probability that I roll two 6's? | 1/36
| 50 people take part in a survey which asks about their favourite TV programme. 23 of them are girls. 6 girls prefer soap operas. What is the probability of me picking a student who prefers soap operas given that they are female? | 6/23
| There are 7 pink marbles and 2 green marbles in a bag. I take 2 marbles from the bag, one at a time, without replacing them.What is the probability of me picking 2 pink marbles? | 42/72
| If 150 students were asked whether they preferred milk or white chocolate and 20 students preferred white chocolate, how many preferred milk chocolate? What is the relative frequency of a student preferring white chocolate? | 130 and 0.13.
| There are 2 red balls and 8 blue balls in a bag. I take 2 balls from the bag, one at a time, and don't replace them. What is the probability of me picking at least 1 red ball? | 34/90
| I flip a coin 10 times but only get 1 tail. Explain why this coin isn't necessarily biased. | Because the coin was only flipped 10 times and the more flips the more accurate the probability.
| The probability of Josh remembering his exercise book is 0.2. What is the probability that he forgets his exercise book? | 0.8
| The relative frequency of someone having an iPhone is 0.65. If I ask 500 people, how many would I expect to have an iPhone? | 325
| I ask 50 people if they support Arsenal and 25 say yes, giving a relative frequency of 0.5. I ask 200 people the same question and 175 people say yes, giving a relative frequency of 0.875. Which is more accurate and why? | 0.875 because more people were asked. |