Mathematics carries the highest weight in AISSEE — 150 of 300 marks in Class 6 and 200 of 400 marks in Class 9 — and it is also a key section of the RMS CET. Practise these 10 MCQs on Average, then check your answers and step-by-step solutions in the answer key at the end.
Quick facts: AISSEE 2027 will be held on Sunday, 31 January 2027. There is no negative marking, so attempt every question. Online applications are open until 2 December 2026 on exams.nta.nic.in/sainik-school-society.
Practice Questions
Q1. Find the average of 48, 15, 31, 45, 51.
(A) 40
(B) 95/2
(C) 35
(D) 38
Q2. What is the average of the first 25 natural numbers?
(A) 25
(B) 25/2
(C) 13
(D) 27/2
Q3. The average of five numbers is 20. Four of them are 22, 15, 24, 23. Find the fifth number.
(A) 10
(B) 22
(C) 7
(D) 16
Q4. What is the average of the first 19 natural numbers?
(A) 19
(B) 19/2
(C) 21/2
(D) 10
Q5. Find the average of 57, 16, 28, 23, 51.
(A) 35
(B) 37
(C) 175/4
(D) 32
Q6. What is the average of the first 49 natural numbers?
(A) 49
(B) 49/2
(C) 25
(D) 51/2
Q7. The average of five numbers is 25. Four of them are 28, 17, 23, 21. Find the fifth number.
(A) 33
(B) 36
(C) 27
(D) 39
Q8. Find the average of 13, 34, 41, 18, 54.
(A) 34
(B) 40
(C) 32
(D) 29
Q9. What is the average of the first 9 natural numbers?
(A) 5
(B) 9
(C) 9/2
(D) 11/2
Q10. The average of five numbers is 25. Four of them are 28, 18, 15, 33. Find the fifth number.
(A) 25
(B) 31
(C) 28
(D) 37
Answer Key with Explanations
(D) 38 — Sum = 190; average = 190 ÷ 5 = 38.
(C) 13 — Average of 1 to n = (n+1)/2 = 13.
(D) 16 — Total = 20×5 = 100; fifth = 100 − 84 = 16.
(D) 10 — Average of 1 to n = (n+1)/2 = 10.
(A) 35 — Sum = 175; average = 175 ÷ 5 = 35.
(C) 25 — Average of 1 to n = (n+1)/2 = 25.
(B) 36 — Total = 25×5 = 125; fifth = 125 − 89 = 36.
(C) 32 — Sum = 160; average = 160 ÷ 5 = 32.
(A) 5 — Average of 1 to n = (n+1)/2 = 5.
(B) 31 — Total = 25×5 = 125; fifth = 125 − 94 = 31.
How did you score?
9–10 correct: excellent — move on to a full-length mock test. 6–8: good — revise the explanations of the questions you missed. Below 6: study this topic again from your NCERT book and retry these questions after two days.
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