JAMB Mathematics 2020 Objective — Question 24
Question 24 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2020 Objective paper, with the correct answer and a full explanation.
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The table shows the marks scored by a group of students in a class test: Score 1,2,3,5,6; Frequency 3,6,7,x,4. Given that the mean score is 3.4, find x.
- A. 2
- B. 3
- C. 4
- D. 5Correct
Explanation
Mean=(3+12+21+5x+24)/(20+x)=3.4. 60+5x=68+3.4x. 1.6x=8. x=5.
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