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Question

Study carefully the table given below and answer the question asked here under.
The following table gives the percentage of students belonging to low income group in each of the five colleges A, B, C, D and E, along with the proportion of males and females with and without low income.
College NamePercentage of students
with low income
Proportion of males
and females
With low incomeWithout low income
M:FM:F
A355:66:7
B253:54:5
C241:22:3
D193:24:3
E155:33:2

Which college has the least number of male students with low income, if we assume that every college has equal number of total students?

The correct answer is
C

Analysis of Male Students with Low Income Across Colleges

The question asks to identify the college with the fewest male students from a low-income group, assuming all colleges have the same total student population. Let the total number of students in each college be N.

Data Extraction and Calculation Approach

We need to calculate the number (or proportion relative to N) of male students with low income for each college. The formula is:

Number of Males (Low Income) = (Total Students) $ \times $ (Percentage Low Income / 100) $ \times $ (Male Ratio / (Male Ratio + Female Ratio))Low Income

Since N is constant, we compare the product: (Percentage Low Income / 100) $ \times $ (Male Ratio / (Male Ratio + Female Ratio)) for each college.

College-wise Calculations

  • College A:
    • Low Income Percentage: 35% = 0.35
    • Male:Female Ratio (Low Income): 5:6
    • Fraction of Males (Low Income): $ \frac{5}{5+6} = \frac{5}{11} $
    • Relative Number: $ 0.35 \times \frac{5}{11} = \frac{35}{100} \times \frac{5}{11} = \frac{7}{20} \times \frac{5}{11} = \frac{35}{220} = \frac{7}{44} $
    • Approximate Value: $ \approx 0.1591 $
  • College B:
    • Low Income Percentage: 25% = 0.25
    • Male:Female Ratio (Low Income): 3:5
    • Fraction of Males (Low Income): $ \frac{3}{3+5} = \frac{3}{8} $
    • Relative Number: $ 0.25 \times \frac{3}{8} = \frac{1}{4} \times \frac{3}{8} = \frac{3}{32} $
    • Approximate Value: $ = 0.09375 $
  • College C:
    • Low Income Percentage: 24% = 0.24
    • Male:Female Ratio (Low Income): 1:2
    • Fraction of Males (Low Income): $ \frac{1}{1+2} = \frac{1}{3} $
    • Relative Number: $ 0.24 \times \frac{1}{3} = \frac{24}{100} \times \frac{1}{3} = \frac{8}{100} = \frac{2}{25} $
    • Approximate Value: $ = 0.08 $
  • College D:
    • Low Income Percentage: 19% = 0.19
    • Male:Female Ratio (Low Income): 3:2
    • Fraction of Males (Low Income): $ \frac{3}{3+2} = \frac{3}{5} $
    • Relative Number: $ 0.19 \times \frac{3}{5} = \frac{19}{100} \times \frac{3}{5} = \frac{57}{500} $
    • Approximate Value: $ = 0.114 $
  • College E:
    • Low Income Percentage: 15% = 0.15
    • Male:Female Ratio (Low Income): 5:3
    • Fraction of Males (Low Income): $ \frac{5}{5+3} = \frac{5}{8} $
    • Relative Number: $ 0.15 \times \frac{5}{8} = \frac{15}{100} \times \frac{5}{8} = \frac{3}{20} \times \frac{5}{8} = \frac{15}{160} = \frac{3}{32} $
    • Approximate Value: $ = 0.09375 $

Comparison and Conclusion

Comparing the calculated relative numbers (or fractions) for male students with low income:

  • College A: $ \frac{7}{44} \approx 0.1591 $
  • College B: $ \frac{3}{32} = 0.09375 $
  • College C: $ \frac{2}{25} = 0.08 $
  • College D: $ \frac{57}{500} = 0.114 $
  • College E: $ \frac{3}{32} = 0.09375 $

The smallest value is 0.08, which corresponds to College C.

Therefore, College C has the least number of male students with low income.

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Important Questions from Tabulation

  1. An object is placed beyond the centre of curvature (C) of a concave mirror. The image formed will be now:
  2. Directions: 

    Using the data from the graph answer the question below: 

    Find the total number of males from sector P and females from sector R together. 

    Ratio of number of male and female employees

     MaleFemale
    P67
    Q59
    R98
    S78
    T35
  3. Directions: 

    Using the data from the graph answer the question below: 

    Number of Employees working in 5 different sector: 

    Find the number of males from sector Q.

     Ratio of number of male and female employees:

     MaleFemale
    P67
    Q59
    R98
    S78
    T35

     

  4. Directions: 

    Using the data from the graph answer the question below: 

    Find the ratio between number of males from the sector T to number of females from the sector S.

  5. Directions: 

    Using the data from the graph answer the question below: 

    Find the total number of males from sector Q and females from sector P together.

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