Percentiles and tail counts

Percentiles and tail counts

Secondary 4
5 marks
TGM Original Questions

The cumulative-frequency curve shows the journey times of 80 pupils.

  1. Estimate the 80th percentile of the journey times.[2]
  2. Estimate the number of pupils whose journey took more than 30 minutes.[1]
  3. Estimate the percentage of pupils whose journey took more than 20 minutes but no more than 40 minutes.[2]

Solution:

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Answer:(a) About \(40\) min (b) About \(40\) pupils (c) About \(50\%\)

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