Grouped pupil heights

Grouped pupil heights

Secondary 2
TGM Original Questions

One hundred heights (cm) are grouped as 130–140:28, 140–150:32, 150–160:30, 160–170:10. Find

  1. the modal class,
  2. the estimated mean,
  3. \(P(130\le h<150)\),
  4. \(P(h\ge150)\).

Solution:

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Answer:(a) 140–150 cm; (b) \(147.2\) cm; (c) \(3/5\); (d) \(2/5\).

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