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Probability 2 (Edexcel GCSE Maths): Quizzes

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Probability 2

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11 questions from this quiz

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What must all probabilities for an event's possible outcomes add up to?

$1$

A spinner has sections with probabilities $0.3$ , $0.25$ , and $0.15$ . What is the 4th probability?

$0.3$

What is the formula for complementary probability?

$1 - P$ (event happens)

The probability of rolling a $6$ is $\frac{1}{6}$ . What is $P$ (not rolling a $6$ )?

$\frac{5}{6}$

If probabilities are $0.12$ , $x$ , $2x$ , and $0.28$ , what is $x$ ?

$0.2$

What is the formula for expectation?

Number of trials $\times$ Probability

If you flip a coin $100$ times, how many heads do you expect?

$50$

What does expectation give you?

A theoretical prediction

For $50$ coin flips, you expect $25$ heads. You get $24$ . Is the coin fair or biased?

Probably fair

For $50$ coin flips, you expect $25$ heads. You get $15$ . Is the coin fair or biased?

Probably biased

Why does sample size matter when testing for bias?

Larger samples give more confidence

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Probability 2 (Edexcel GCSE Maths): Quizzes

Practise the questions

What must all probabilities for an event's possible outcomes add up to?

A spinner has sections with probabilities 0.30.30.3, 0.250.250.25, and 0.150.150.15. What is the 4th probability?

What is the formula for complementary probability?

The probability of rolling a 666 is 16\frac{1}{6}61​. What is PPP(not rolling a 666)?

If probabilities are 0.120.120.12, xxx, 2x2x2x, and 0.280.280.28, what is xxx?

What is the formula for expectation?

If you flip a coin 100100100 times, how many heads do you expect?

What does expectation give you?

For 505050 coin flips, you expect 252525 heads. You get 242424. Is the coin fair or biased?

For 505050 coin flips, you expect 252525 heads. You get 151515. Is the coin fair or biased?

Why does sample size matter when testing for bias?

Explore Edexcel GCSE Maths Revision Notes by Topics

Two-way tables

Pictograms

Bar charts

Pie charts

Scatter graphs

Averages and range

Averages from tables 1

Averages from tables 2

Line graphs

Stem-and-leaf diagrams

Sampling

Comparing data

Probability 1

Probability 2

Relative frequency

Frequency and outcomes

Line graphs

Stem-and-leaf diagrams

Sampling

Comparing data

Probability 1

Probability 2

Relative frequency

Frequency and outcomes

Venn diagrams

Set notation

Independent events

Explore Edexcel GCSE Maths Model Answers by Topics

Two-way tables

Pictograms

Bar charts

Pie charts

Scatter graphs

Averages and range

Averages from tables 1

Averages from tables 2

Line graphs

Stem-and-leaf diagrams

Sampling

Comparing data

Probability 1

Probability 2

Relative frequency

Frequency and outcomes

Line graphs

Stem-and-leaf diagrams

Sampling

Comparing data

Probability 1

Probability 2

Relative frequency

Frequency and outcomes

Venn diagrams

Set notation

Independent events

Explore Edexcel GCSE Maths Flashcards by Topics

Two-way tables

Pictograms

Bar charts

Pie charts

Scatter graphs

Averages and range

Averages from tables 1

Averages from tables 2

Line graphs

Stem-and-leaf diagrams

A spinner has sections with probabilities $0.3$ , $0.25$ , and $0.15$ . What is the 4th probability?

The probability of rolling a $6$ is $\frac{1}{6}$ . What is $P$ (not rolling a $6$ )?

If probabilities are $0.12$ , $x$ , $2x$ , and $0.28$ , what is $x$ ?

If you flip a coin $100$ times, how many heads do you expect?

For $50$ coin flips, you expect $25$ heads. You get $24$ . Is the coin fair or biased?

For $50$ coin flips, you expect $25$ heads. You get $15$ . Is the coin fair or biased?