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primary 6 | Maths
| Data Analysis
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Date Posted: 5 years ago
Views: 280
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
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
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
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
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Date Posted:
5 years ago
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