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2.2 Data presentation and interpretation

2.2 Data presentation and interpretation

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Question 42

The number of faults found on each car in a batch is summarised in the table below, where a a\,a is a positive integer.

Number of faults01234
Frequency10aaa1893

The mean number of faults per car is exactly 1.5.

a.

Find the value of aaa.

[3]
b.

Find the standard deviation of the number of faults.

[2]
Markscheme

2.2 Data presentation and interpretation Questions

  1. A Level
  2. /Maths
  3. /2.2 Data presentation and interpretation

105 exam-style questions on WJEC A Level Maths 2.2 Data presentation and interpretation, covering 2.2.1 Data presentation and interpretation, 2.2.2 Data presentation and interpretation, 2.2.3 Data presentation and interpretation, 2.2.4 Data presentation and interpretation, 2.2.5 Data presentation and interpretation, 2.2.6 Data presentation and interpretation, 2.2.7 Data presentation and interpretation, 2.2.8 Data presentation and interpretation, and 2.2 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.

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