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2.5 Data presentation and interpretation

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Question 13

For 30 observations, the recorded summary statistics are ∑x=600\sum x=600∑x=600 and ∑x2=13200\sum x^2=13200∑x2=13200. A value of 20 was incorrectly recorded as 40.

a.

Find the corrected values of ∑x \sum x\,∑x and ∑x2\sum x^2∑x2.

[2]
b.

Calculate the corrected variance.

[3]
Markscheme

2.5 Data presentation and interpretation Questions

  1. A Level
  2. /Maths
  3. /2.5 Data presentation and interpretation

278 exam-style questions on CCEA A Level Maths 2.5 Data presentation and interpretation, covering 2.5.1 Data presentation and interpretation, 2.5.2 Data presentation and interpretation, 2.5.3 Data presentation and interpretation, 2.5.4 Data presentation and interpretation, 2.5.5 Data presentation and interpretation, 2.5.6 Data presentation and interpretation, 2.5.7 Data presentation and interpretation, 2.5.8 Data presentation and interpretation, 2.5.9 Data presentation and interpretation, and 2.5 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.

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