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2.2 Data Presentation and Interpretation

2.2 Data Presentation and Interpretation

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Question 28

Group A contains 30 observations with mean 12 and variance 4. Group B contains 20 observations with mean 18 and variance 9.

a.

Calculate the mean of all 50 observations.

[2]
b.

Calculate the variance and standard deviation of all 50 observations.

[4]
Markscheme

2.2 Data Presentation and Interpretation Questions

  1. A Level
  2. /Maths
  3. /2.2 Data Presentation and Interpretation

121 exam-style questions on OCR A Level Maths 2.2 Data Presentation and Interpretation, covering 2.2.1 Tables and diagrams for single variable data, 2.2.2 Area in a histogram, 2.2.3 Scatter diagrams and regression lines, 2.2.4 Informal interpretation of correlation, 2.2.5 Correlation and causation, 2.2.6 Measures of average and spread, 2.2.7 Calculations of mean and standard deviation, 2.2.8 Outliers, 2.2.9 Selecting or critiquing data presentation, and 2.2.10 Cleaning data. Each one has a worked solution and a mark scheme showing where the marks go.

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