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2.2.3 Central tendency, variation and standard deviation

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Question 12

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

2.2.3 Central tendency, variation and standard deviation Questions

  1. A Level
  2. /Maths
  3. /2.2.3 Central tendency, variation and standard deviation

39 exam-style questions on AQA A Level Maths 2.2.3 Central tendency, variation and standard deviation. Each one has a worked solution and a mark scheme showing where the marks go.

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