JAMB 2001 · UME · Q43

Using the same table, the mean score is

Score	4	7	8	11	13	8
Frequency	3	5	2	7	2	1

Worked solution (try it first)

Multiply each score by its frequency and add: $12 + 35 + 16 + 77 + 26 + 8 = 174$ .
Total frequency: $3 + 5 + 2 + 7 + 2 + 1 = 20$ .
Mean $= \frac{174}{20} = 8.7$ , option C.