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Cambridge IGCSE Statistics practice

Paper 1 structured question: Probability distributions

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Probability distributions

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Paper 1Statistical Techniques3 marks

A random variable X can take values 1, 3, and 5 with probabilities 0.2, 0.5, and 0.3 respectively.

Data Table

Probability Distribution of X

Value (X)Probability
10.2
30.5
50.3
  1. a

    Calculate the expected value of X.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 1 structured question: Probability distributions

Paper 1Statistical Techniques3 marks

Description

Game Winnings

Possible winnings and their probabilities based on a fair six-sided die:

Winnings (£)Probability
101/6
52/6
03/6
  1. a

    Calculate the expected winnings from playing the game once.

    Aim for approximately 3 distinct marking points.

    [3]