Average hourly earnings(N) 5−9 10−14 15−19 20−24 No. of workers 17 32 25 24 Estimate the mode of the above frequency distribution

Assessment: JAMB UTME - Mathematics - 1998 Subject: General Mathematics

Question 1 Report

Average hourly earnings(N) 5−9 10−14 15−19 20−24
No. of workers 17 32 25 24

Estimate the mode of the above frequency distribution

Answer Details
Class intervals F Class boundary 5 − 7 17 4.5 − 9.5 10 − 14 32 9.5 − 14.5 15 − 19 25 14.5 − 19.5 20 − 24 24 19.5 − 24.5
mode = 9 +  D 1 D 2 + D 1  x C
= 9.5 +  5 ( 32 − 17 ) 2 ( 32 ) − 17 − 25
= 9.5 +  75 27
= 12.27
≈  2.3

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