Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.



Question

primary 6 | Maths | Data Analysis
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
Zi qi
Zi Qi

primary 6 chevron_right Maths chevron_right Data analysis chevron_right Singapore

How to do this qn?

Date Posted: 4 years ago
Views: 238
Eric Nicholas K
Eric Nicholas K
4 years ago
Assume she obtained all correct.

Then answering 45 correct gets her 45 x 4 = 180 marks.

(Correct is gain 4 marks, never do is nothing, wrong is LOSE 1 mark)

This cannot be the case, as she obtained 135 marks

44 correct, 1 wrong is 175 marks once you compute.
43 correct 2 wrong 170 marks
42 correct 3 wrong 165 marks

And so on. Every change is -5 marks.

We continue until

36 correct 9 wrong 135 marks
AC Lim
AC Lim
4 years ago
Beside guess and check...
You may try this method
Assume all correct,
45x4=180 marks

If answer correct = gain 4 marks
If answer wrongly =-1-4=-5 (u need to -4 since we have given 4 marks to all questions)

Since Natalie scored 135 marks,
Mark she lost = 180-135= 45 marks

Therefore number of question answer wrongly = 45/5=9 question

Total question answer correctly = 45-9=36

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Zhongyan
Zhongyan's answer
5 answers (Tutor Details)
1st
Hope this helps!