Proportion of Pupils Speaking 3 Languages Out of Total Number of Pupils

  • Context: High School 
  • Thread starter Thread starter Matt
  • Start date Start date
Click For Summary
SUMMARY

The discussion focuses on calculating the proportion of pupils who speak three languages out of a total of 29 pupils. The correct method is to divide the total number of pupils (29) by the number of pupils who speak three languages (3), resulting in a proportion of 9.7 when rounded to one decimal place. A misunderstanding arises when an incorrect method is applied, leading to an illogical percentage exceeding 100%. The correct interpretation emphasizes the importance of understanding proportion calculations accurately.

PREREQUISITES
  • Understanding of basic mathematical concepts, specifically ratios and proportions.
  • Familiarity with decimal rounding techniques.
  • Ability to interpret and analyze mathematical problems accurately.
  • Knowledge of how to apply division in real-world contexts.
NEXT STEPS
  • Research methods for calculating ratios and proportions in various contexts.
  • Learn about decimal rounding rules and their applications in mathematics.
  • Explore common misconceptions in mathematical problem-solving.
  • Practice solving proportion-related problems with different datasets.
USEFUL FOR

Students, educators, and anyone involved in teaching or learning mathematics, particularly in understanding ratios and proportions.

Matt
Messages
11
Reaction score
0
I have attached a screenshot of the question. The methodology and answer that makes sense to me is the following:

29 (Total number of pupils) / 3 (Number of pupils who speak 3 languages) = 9.7 (1 d.p)

The answer given:
3 / 29 = 0.1 (1 d.p)

Have a misunderstood the question here? Any help is greatly appreciated.
 

Attachments

  • Screen Shot 2014-11-21 at 21.25.13.png
    Screen Shot 2014-11-21 at 21.25.13.png
    65.3 KB · Views: 559
Physics news on Phys.org
Your method gives you how many times a class of 29 pupils can be divided up into sets of 3 pupils. That wasn't the question.

Your answer gives 900+ percent. How do you get more than 100% of the class? Obviously you can't. The answer given in the figure is correct.
 
Matt said:
29 (Total number of pupils) / 3 (Number of pupils who speak 3 languages) = 9.7 (1 d.p)
Look at a simpler case.
Four balls: red, green blue and yellow.
What proportion are red?
It wouldn't be total / red because that would give you 4.
 

Similar threads

  • · Replies 31 ·
2
Replies
31
Views
3K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 11 ·
Replies
11
Views
4K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 8 ·
Replies
8
Views
1K
  • · Replies 3 ·
Replies
3
Views
4K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 4 ·
Replies
4
Views
5K