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Edexcel IGCSE Math A Higher 6.3.J expected frequency

Edexcel IGCSE Math A Higher 6.3.J expected frequency
Edexcel IGCSE Math A syllabusMath A 4MA1First assessment 2018

Practise expected-frequency questions by multiplying the probability by the number of trials or using totals to complete probability tables.

How this is tested

  • Calculate expected frequency by multiplying probability by the number of trials.
  • Use probabilities in a table to estimate counts for spinner colours or outcomes.
  • Complete missing probabilities before using them to find expected numbers.

Question 4(b)

[Maximum number: 4]

Here is a biased 5-sided spinner.
When the spinner is spun, it can land on blue or on green or on purple or on red or on yellow.

Figure for Question 4(b) — Edexcel IGCSE Math a Higher

The table gives information about the probability of the spinner landing on each colour.

Table for Question 4(b) — Edexcel IGCSE Math a Higher

Sophie spins the spinner once.

Work out an estimate for the number of times the spinner lands on red.