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4MA1/1F Jun 2022, Question 12: Averages from Frequency Tables

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 4 marks

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The question, in short

From a frequency table of gold stars won by 25 students in class 7T, find the mean number of stars, and use a given probability for class 8R.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 3 marks

Calculate the mean number of gold stars won by the 25 students using the frequency table.

  1. 10 × 6 = 0
  2. 21 × 5 = 5
  3. 32 × 4 = 8
  4. 43 × 7 = 21
  5. 54 × 3 = 12
  6. 60 + 5 + 8 + 21 + 12 = 46
  7. 746 ÷ 25 = 1.84

Answer1.84

Part (b) · 1 mark

Given the probability a randomly chosen student won at least one gold star is 0.39, find the probability they did not.

  1. 11 − 0.39 = 0.61

Answer0.61

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