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Edexcel IGCSE Math A 6.3.J expected frequency

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

Syllabus
First assessment 2018
Course
Math A 4MA1
Level
Higher

Exam points

  • 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.

6.3.J Expected frequency question 1

[Maximum number: 2]

Grace is going to spin the arrow on the spinner once.

The table below gives the probabilities that the spinner will land on red or on blue or on green.
The probability that the spinner will land on orange is 3 times the probability that the spinner will land on pink.

Figure for Question 6.3.J Expected frequency question 1 — Edexcel IGCSE Math A Higher
Table for Question 6.3.J Expected frequency question 1 — Edexcel IGCSE Math A Higher

Grace spins the arrow on the spinner 150 times.

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

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