NECO Mathematics 2025 Theory — Question 12
Question 12 of 12 from the National Examinations Council (NECO) Mathematics 2025 Theory paper, with the correct answer and a full explanation.
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12. Table 2.3 shows the frequency distribution of marks obtained by 50 students in an examination. Continue the graphing and table-completion exercise from Q10-11 above using the same class data, and confirm the roots and gradient found graphically against the algebraic values. (12 marks)
Model answer
This item continues the table-completion, graphing, and reading exercise begun in Q10/Q11: substitute the class midpoints/x-values into the relevant function, plot to the given scale, and read off the roots and gradient from the graph, cross-checking against the algebraic (calculated) values for accuracy.
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