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2.2 Data Presentation and Interpretation

2.2 Data Presentation and Interpretation

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Question 31

A histogram has classes 0≤x<100\leq x<100≤x<10, 10≤x<25 10\leq x<25\,10≤x<25 and 25≤x<3025\leq x<3025≤x<30. The first two frequency densities are 1.2 and 0.8, and the total frequency is 30.

a.

Find the frequency density for 25≤x<3025\leq x<3025≤x<30.

[2]
b.

Find the probability that a randomly selected observation is at least 25.

[1]
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 (MEI) A Level Maths 2.2 Data Presentation and Interpretation, covering 2.2.1 Types of data and standard diagrams, 2.2.2 Area in a histogram is proportional to frequency, 2.2.3 Cumulative frequency diagram, 2.2.4 Describe frequency distributions, 2.2.5 Samples and theoretical distributions, 2.2.6 Interpret a scatter diagram, 2.2.7 Distinct sections and outliers in scatter diagrams, 2.2.8 Correlation and causation, 2.2.9 Select or critique data presentation techniques, 2.2.10 Measures of central tendency, 2.2.11 Simple measures of spread, 2.2.12 Variance and standard deviation, 2.2.13 Outliers, 2.2.14 Cleaning data, 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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