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2 Statistics

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Question 163

For 200 observations, a cumulative-frequency curve gives approximately Q1=24Q_1=24Q1​=24, median =39 and Q3=61Q_3=61Q3​=61.

a.

State the cumulative frequencies used to read these three values.

[3]
b.

Calculate the IQR and the two 1.5×IQR1.5\times\mathrm{IQR}1.5×IQR outlier fences.

[3]
c.

Explain why values read from the curve are estimates.

[1]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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