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Quantitative Aptitude · Bank exam practice

Average questions for bank exams

Average questions involve adding or removing items, correcting wrong entries and the averages of groups. Plutomonk has 1,040 Average questions in Prelims and Mains sets of 10, each with a worked solution. They are useful for IBPS PO, SBI PO, IBPS Clerk, SBI Clerk, IBPS RRB and RBI Assistant.

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Quick tip

Work with total = average × count. Most average questions become one subtraction once you use totals.

Average sample questions with answers

These are from the first Prelims and Mains sets. Try each question before you open the solution.

Q1. Find the average of 64, 60, 63, 64, 65, 54, 75, 59.

  1. 63
  2. 66
  3. 65
  4. 61
  5. 62
Show answer and solution

Answer: A. 63

Sum = 504, count = 8. Average = 63.

Q2. Find the average of 52, 67, 45, 55, 53, 63, 58, 65, 73.

  1. 57
  2. 62
  3. 61
  4. 60
  5. 59
Show answer and solution

Answer: E. 59

Sum = 531, count = 9. Average = 59.

Q3. Find the average of 57, 68, 53, 46, 52, 72.

  1. 58
  2. 60
  3. 59
  4. 61
  5. 56
Show answer and solution

Answer: A. 58

Sum = 348, count = 6. Average = 58.

Q4. Find the average of 35, 37, 21, 14, 38, 28, 30.

  1. 29
  2. 32
  3. 30
  4. 31
  5. 27
Show answer and solution

Answer: A. 29

Sum = 203, count = 7. Average = 29.

Q5. Find the average of 80, 69, 63, 80, 33.

  1. 68
  2. 64
  3. 66
  4. 67
  5. 65
Show answer and solution

Answer: E. 65

Sum = 325, count = 5. Average = 65.

Q6. Find the average of 79, 58, 69, 67, 72, 80, 73, 38.

  1. 66
  2. 68
  3. 65
  4. 67
  5. 69
Show answer and solution

Answer: D. 67

Sum = 536, count = 8. Average = 67.

Q7. Find the average of 62, 56, 60, 45, 47, 70, 50, 90.

  1. 63
  2. 60
  3. 62
  4. 59
  5. 58
Show answer and solution

Answer: B. 60

Sum = 480, count = 8. Average = 60.

Q8. Find the average of 37, 38, 32, 26, 54, 42, 54, 35, 42.

  1. 40
  2. 43
  3. 38
  4. 42
  5. 39
Show answer and solution

Answer: A. 40

Sum = 360, count = 9. Average = 40.

Q9. The average age of 20 students is 27 years. When the teacher's age is included, the average increases by 2 years. Find the teacher's age.

  1. 67 years
  2. 29 years
  3. 70 years
  4. 49 years
  5. 69 years
Show answer and solution

Answer: E. 69 years

Teacher = 29 × 21 − 27 × 20 = 69 years.

Q10. The average of 8 numbers is 52. Later it was found that 112 was misread as 76. Find the correct average.

  1. 52
  2. 56
  3. 47.5
  4. 56.5
  5. 58.5
Show answer and solution

Answer: D. 56.5

Correct sum = 416 − 76 + 112 = 452. Average = 56.5.

Q11. The average age of 45 students is 31 years. When the teacher's age is included, the average increases by 2 years. Find the teacher's age.

  1. 124 years
  2. 123 years
  3. 121 years
  4. 78 years
  5. 33 years
Show answer and solution

Answer: B. 123 years

Teacher = 33 × 46 − 31 × 45 = 123 years.

Q12. The average age of 20 students is 29 years. When the teacher's age is included, the average increases by 1 year. Find the teacher's age.

  1. 50 years (1)
  2. 30 years
  3. 49 years
  4. 51 years
  5. 50 years
Show answer and solution

Answer: E. 50 years

Teacher = 30 × 21 − 29 × 20 = 50 years.

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