Completing a partial revision-time histogram

Completing a partial revision-time histogram

Secondary 2
TGM Original Questions

Revision-hour classes 0–5,5–10,10–15,15–20,20–25 have frequencies 12,\(p\),28,8,12. The scaled partial histogram shows the second bar reaching frequency 20.

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

Solution:

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

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