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Cambridge IGCSE Statistics practice

Paper 1 structured question: Transformations of data sets

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Transformations of data sets

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Paper 1Statistical Techniques3 marks

Two classes have test scores with means of 75 and 85. Class A has 10 students, and Class B has 15 students.

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Class Test Scores

Class A has a mean score of 75 with 10 students. Class B has a mean score of 85 with 15 students.

  1. a

    Calculate the mean score for all students combined.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 1 structured question: Transformations of data sets

Paper 1Statistical Techniques5 marks

Data Table

Product Sales

The table shows the number of products sold each day.

DayProducts Sold
Monday12
Tuesday15
Wednesday14
Thursday19
  1. a

    Calculate the mean number of products sold per day.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Calculate the standard deviation of the products sold.

    Aim for approximately 3 distinct marking points.

    [3]