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2 Statistics

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Question 115

A histogram has frequency densities 1, 1, 4, 8 and 6 for the intervals 0–30, 30–60, 60–90, 90–120 and 120–150 seconds. The total frequency for times exceeding 150 seconds is 120.

Estimate the percentage of people who took less than 90 seconds.

[4]
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2 Statistics Questions

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

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