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Question

The following table shows the number of students (Boys and Girls) and the percentage of girls who passed in a 10+2 examination from six different schools (A-F) in the year 2023 and 2024. Based on the data in the table, answer the questions that follow.
School-wise Details of Students Passing in a 10+2 examination
 

SchoolYear
Year 2023Year 2024
Number of Passed StudentsPercentage of Passed GirlsNumber of Passed StudentsPercentage of Passed Girls
A50046%55044%
B60042%64040%
C65056%56045%
D72060%80048%
E60054%84055%
F65050%75036%

What is the average number of boys who passed in the 10+2 examination in the year 2024 from all the six schools (A-F) together?

The correct answer is
379

Understanding the 10+2 Examination Data for Schools A-F

The question asks us to find the average number of boys who passed the 10+2 examination in the year 2024 across six different schools (A through F). We are given the total number of passed students and the percentage of girls who passed for each school in 2024.

Calculating Number of Boys Passed in 2024 for Each School

To find the number of boys who passed, we first need to calculate the number of girls who passed using the given percentage and then subtract this from the total number of passed students for each school.

The formula used is:

  • Number of Girls Passed = (Percentage of Passed Girls / 100) × Total Number of Passed Students
  • Number of Boys Passed = Total Number of Passed Students - Number of Girls Passed

School A (2024)

  • Total Passed Students = 550
  • Percentage of Passed Girls = 44%
  • Number of Girls Passed = $\frac{44}{100} \times 550 = 0.44 \times 550 = 242$
  • Number of Boys Passed = $550 - 242 = 308$

School B (2024)

  • Total Passed Students = 640
  • Percentage of Passed Girls = 40%
  • Number of Girls Passed = $\frac{40}{100} \times 640 = 0.40 \times 640 = 256$
  • Number of Boys Passed = $640 - 256 = 384$

School C (2024)

  • Total Passed Students = 560
  • Percentage of Passed Girls = 45%
  • Number of Girls Passed = $\frac{45}{100} \times 560 = 0.45 \times 560 = 252$
  • Number of Boys Passed = $560 - 252 = 308$

School D (2024)

  • Total Passed Students = 800
  • Percentage of Passed Girls = 48%
  • Number of Girls Passed = $\frac{48}{100} \times 800 = 0.48 \times 800 = 384$
  • Number of Boys Passed = $800 - 384 = 416$

School E (2024)

  • Total Passed Students = 840
  • Percentage of Passed Girls = 55%
  • Number of Girls Passed = $\frac{55}{100} \times 840 = 0.55 \times 840 = 462$
  • Number of Boys Passed = $840 - 462 = 378$

School F (2024)

  • Total Passed Students = 750
  • Percentage of Passed Girls = 36%
  • Number of Girls Passed = $\frac{36}{100} \times 750 = 0.36 \times 750 = 270$
  • Number of Boys Passed = $750 - 270 = 480$

Calculating the Average Number of Boys Passed in 2024

Now, we sum the number of boys who passed from all six schools in 2024 and divide by the number of schools (which is 6) to find the average.

Total Number of Boys Passed (2024)

Total Boys Passed = Boys (A) + Boys (B) + Boys (C) + Boys (D) + Boys (E) + Boys (F)

Total Boys Passed = $308 + 384 + 308 + 416 + 378 + 480 = 2274$

Average Number of Boys Passed (2024)

Average Boys Passed = $\frac{\text{Total Boys Passed}}{\text{Number of Schools}}$

Average Boys Passed = $\frac{2274}{6} = 379$

Therefore, the average number of boys who passed the 10+2 examination in the year 2024 from all six schools is 379.

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Important Questions from Average

  1. Average of 40 numbers is 71, if the number 100 replaced by 140, then average is increased by

  2. The captain of a football team of 11 members is 28 years old and the goalkeeper is 4 years older than him. If the ages of these two are removed, then the average age of the remaining players is two years less than the average age of the whole team. What is the average age of the team?

  3. There are two Classes A and B having 25 and 30 students respectively. In Class-A the highest score is 21 and lowest score is 17. In Class-B the highest score is 30 and lowest score is 22. Four students are shifted from Class-A to Class-B.

    Consider the following statements:

    1. The average score of Class-B will definitely decrease.

    2. The average score of Class-A will definitely increase.

    Which of the above statements is/are correct?

  4. The average weight of A, B, Cis 40 kg, the average weight of B, D, Eis 42 kg and the weight of Fis equal to that of B. What is the average weight of A, B, C, D, Eand F?

  5. A cow costs more than 4 goats but less than 5 goats. If a goat costs between Rs. 600 and Rs. 800, which of the following is a most valid conclusion?

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