SPM 2020 Add Maths Paper 1, Question 21Statistics
Solved on video in English and Bahasa Melayu · 3 marks · Older syllabus, Statistics · 4:09 video
The question
There are 30 students in class K. Sue and Ben are students of the class. Sue scored 10 marks more than Ben in a quiz. The mean mark of the students in the quiz is 50x, where x is a constant. When Ben transferred to another class, the mean mark for the students of class K increased by 1. Calculate Sue's mark in terms of x.
[3 marks]
4:09Step 1
Let Ben's mark = y, so Sue's mark = y + 10.
5 more steps, each with the reason for it, in the full solution
Final answer
Sue's mark = 50x − 19
Where students lose marks
Watch out: after Ben leaves there are 29 students, not 30, so divide the new total by 29 when you form the equation.
Watch every step of this question solved on video (4:09), with the reason behind each step and a box that checks your own answer.
No card. Every past-year question on video, in English and BM.
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