WAEC - Mathematics (2022 - No. 35)
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
12
13
15
20
Explanation
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 →15
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