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primary 6 | Maths
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Date Posted: 4 years ago
Views: 348
The "distance" between 70 and 86 is 16 units. The "distance" between 86 and 92 is 6 units.
The ratio of the numbers must be reversed for us to obtain this particular average score of 86.
p/n is 6/16, or 3/8.
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Check.
For every 3 students scoring 70 marks and 8 students scoring 92,
Total number of marks
= 3 x 70 + 8 x 92
= 210 + 736
= 946
Total number of students
= 3 + 8
= 11
Average score
= 946 / 11
= 86
Repeat this pattern for as many groups in that manner and the average remains 86.
The ratio of the numbers must be reversed for us to obtain this particular average score of 86.
p/n is 6/16, or 3/8.
----------------------------------
Check.
For every 3 students scoring 70 marks and 8 students scoring 92,
Total number of marks
= 3 x 70 + 8 x 92
= 210 + 736
= 946
Total number of students
= 3 + 8
= 11
Average score
= 946 / 11
= 86
Repeat this pattern for as many groups in that manner and the average remains 86.
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Date Posted:
4 years ago
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