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Completing a partial revision-time histogram

Completing a partial revision-time histogram

Secondary 2
7 marks
TGM Original Questions

Revision-hour classes \(0\le t<5\), \(5\le t<10\), \(10\le t<15\), \(15\le t<20\), \(20\le t<25\) have frequencies 12,\(p\), 28, 8, 12. A partial histogram is shown. Let t be the number of revision hours.

  1. Find \(p\).[1]
  2. Complete the remaining three bars using the frequencies given.[2]
  3. Find the median class.[1]
  4. Estimate the mean.[3]

Solution:

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Answer:(a) \(p=20\) (b) remaining bar heights \(28,8,12\) (c) \(10\le t<15\) h (d) \(11.75\) h.

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