JAMB Mathematics 2016 Paper

Concept:The mean score is found by dividing the total score obtained by all students by the total number of students.Explanation:Multiply each score by its corresponding frequency and sum the results to get the total score.$$(3 \times 0) + (2 \times 1) + (5 \times 2) + (5 \times 3) + (5 \times 4) + (10 \times 5) + (4 \times 6) + (3 \times 7) + (1 \times 8) + (2 \times 9) = 168$$Add all the frequencies to obtain the total number of students.$$3 + 2 + 5 + 5 + 5 + 10 + 4 + 3 + 1 + 2 = 40$$Apply the mean formula.$$\text{Mean} = \frac{\sum fx}{\sum f} = \frac{168}{40}$$$$\text{Mean} = 4.2$$Answer:The mean score is $4.2$, so the correct option is C.