Probability (OCR GCSE Maths): Quizzes

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Probability
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What does a probability of 11 mean?

The event is certain to happen

What does a probability of 00 mean?

The event is impossible

What is P(vowel)P(vowel) when picking from 26 alphabet tiles?

526\frac{5}{26}

If you know a tile is a vowel, what is P(A)P(A)?

15\frac{1}{5}

For mutually exclusive events, how do you find P(AP(A or B)B)?

Add the probabilities

For independent events, how do you find P(AP(A and B)B)?

Multiply the probabilities

What is the formula for P(NotA)P(Not A)?

1−P(A)1 - P(A)

If P(beans)=0.6P(beans) = 0.6 and P(sausage)=0.25P(sausage) = 0.25, find P(beansP(beans or sausage)sausage).

0.850.85

If P(nofood)=0.05P(no food) = 0.05, what is P(food)P(food)?

0.950.95

How many equally likely outcomes are there when flipping two coins?

44

What is P(oneheadP(one head and onetail)one tail) for two coins?

12\frac{1}{2}

How many total outcomes are there when rolling two dice?

3636

If P(score1)=518P(score 1) = \frac{5}{18} and you roll 180180 times, how many score 11s expected?

5050

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