Probability 2 (AQA GCSE Maths): Quizzes

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Probability 2
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What do the probabilities of all possible outcomes always sum to?

11

What is the formula for complement probability?

P(not) = 11 - P(event)

The probability of rolling a 6 on a dice is 16\frac{1}{6}. What is the probability of NOT rolling a 6?

56\frac{5}{6}

A bag has 4 colors. P(red) = 0.250.25, P(blue) = 0.300.30, P(green) = 0.150.15. Find P(yellow).

0.300.30

P(red) = 0.120.12, P(blue) = xx, P(white) = 2x2x, P(green) = 0.280.28. Find xx.

0.20.2

What is the formula for expectation?

Trials ×\times probability

A coin is flipped 100 times. How many heads would you expect?

5050

Does expectation give an exact or approximate answer?

Approximate

What does 'fair' mean in probability?

All outcomes equally likely

A coin flipped 50 times gets 15 heads and 35 tails. What does this suggest?

Probably biased towards tails

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