NECO 2023 · Paper 1 · Q54

Find the mean of the frequency distribution, correct to one decimal place.

Marks	2	5	7	8	9	10
Frequency	9	4	3	7	8	2

Worked solution (try it first)

Multiply each mark by its frequency and add: $18 + 20 + 21 + 56 + 72 + 20 = 207$ .
Total frequency: $9 + 4 + 3 + 7 + 8 + 2 = 33$ .
Mean $= \frac{207}{33} = 6.27$ , which is 6.3 to one decimal place, option C.