SPM 2017 Add Maths Paper 1, Question 23Statistics
Solved on video in English and Bahasa Melayu · 4 marks · Older syllabus, Statistics · 5:07 video
The question
A set of data consists of 2, 3, 4, 5 and 6. Each number in the set is multiplied by m and added by n, where m and n are integers. It is given that the new mean is 17 and the new standard deviation is 4.242. Find the value of m and of n.
[4 marks]
5:07Step 1
Sum(x) = 2+3+4+5+6 = 20, so original mean = 20/5 = 4.
4 more steps, each with the reason for it, in the full solution
Final answer
m = 3, n = 5
Where students lose marks
Watch out: use m × SD = 4.242, not m² × variance, and round 2.9995 to the integer m = 3.
Watch every step of this question solved on video (5:07), 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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