The age (years) of some members in a singing group are: 12, 47, 49, 15, 43, 41, 13, 39, 43, 41 and 36.

Find the lower quartile

  • A 12
  • B 13
  • C 15
  • D 20
waec 2022mathematics

The correct answer is C. 15

Rearranged: 12,13,15, 36, 39, 41, 41, 43, 43, 47 and 49

Lower quartile or First quartile = \(\frac{total number of items}{4}\)

If odd: items numbers + 1 → \(\frac{11 items + 1}{4}\)

= \(\frac{12}{4}\)

Lower quartile = 3rd iems â†’15

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