Grouped ages of books

Grouped ages of books

Secondary 2
TGM Original Questions

Book ages (years) are grouped into 0–10,10–20,20–30,30–40,40–50,50–60 with frequencies 8,14,22,18,10,8. Find

  1. the modal class,
  2. the estimated mean,
  3. \(P(\text{age}<40)\).

Solution:

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Answer:(a) 20–30 years; (b) \(29\) years; (c) \(31/40\).

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