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2.1 K: Statistical sampling

2.1 K: Statistical sampling

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Question 5

The CO emissions, in g/km, of a random sample of 25 cars are recorded. The mean of the 25 recorded values is 0.28 g/km.

It is then discovered that one car's CO emission was recorded as 0.85 g/km when the correct value is 0.35 g/km. No other value is wrong.

For this question, a value is defined to be an outlier if it is more than two standard deviations from the mean.

a.

Calculate the mean of the 25 corrected values.

[3]
b.

The standard deviation of the 25 corrected values is 0.06 g/km. Determine whether the corrected value of 0.35 g/km is an outlier.

[2]
Markscheme

2.1 K: Statistical sampling Questions

  1. A Level
  2. /Maths
  3. /2.1 K: Statistical sampling

28 exam-style questions on AQA A Level Maths 2.1 K: Statistical sampling, covering 2.1.1 Populations, samples and sampling techniques. Each one has a worked solution and a mark scheme showing where the marks go.

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