ISSB - Pak Navy Officer Selection Mathematics Averages — Set 3

ISSB - Pak Navy Officer Selection Mathematics Averages — Set 3

1. Question 1

   Q1. Average of 3, 7, 11, 15, 19, 23?

   • A) 12
   • B) 13
   • C) 14
   • D) 15

   Answer: 13

   Explanation: Sum 78 divided by 6 equals 13. Work each step carefully; ISSB math rewards accuracy under time pressure.

2. Question 2

   Q2. Sum of first 10 natural numbers?

   • A) 45
   • B) 50
   • C) 55
   • D) 60

   Answer: 55

   Explanation: Formula n(n+1)/2 gives 10 times 11 divided by 2 equals 55. Work each step carefully; ISSB math rewards accuracy under time pressure.

3. Question 3

   Q3. Median of 3, 7, 9, 11, 15?

   • A) 7
   • B) 9
   • C) 10
   • D) 11

   Answer: 9

   Explanation: Middle value in sorted list of five numbers is 9. Work each step carefully; ISSB math rewards accuracy under time pressure.

4. Question 4

   Q4. Average of squares of 2, 4, 6?

   • A) 14
   • B) 16
   • C) 18
   • D) 56/3

   Answer: 56/3

   Explanation: Squares 4,16,36 sum 56 divided by 3 equals 56/3. Apply the same method to similar ISSB quantitative items.

5. Question 5

   Q5. Average of 7, 14, 21, 28?

   • A) 15
   • B) 16
   • C) 17.5
   • D) 18

   Answer: 17.5

   Explanation: Sum is 70 divided by 4 gives average 17.5. Apply the same method to similar ISSB quantitative items.

6. Question 6

   Q6. Average of 10 numbers is 20. Sum?

   • A) 180
   • B) 190
   • C) 200
   • D) 210

   Answer: 200

   Explanation: Sum equals average times count so 20 times 10 is 200. Apply the same method to similar ISSB quantitative items.

7. Question 7

   Q7. Mean of 5, 10, 15, 20, 25, 30?

   • A) 15
   • B) 16
   • C) 17
   • D) 18

   Answer: 15

   Explanation: Sum 105 divided by 7 equals 15. 15 is correct because it matches what the question requires. Apply the same method to similar ISSB quantitative items.

8. Question 8

   Q8. Weighted average: 4 items avg 8, 6 items avg 18?

   • A) 12
   • B) 13
   • C) 14
   • D) 15

   Answer: 14

   Explanation: Total sum 32 plus 108 divided by 10 items equals 14. Apply the same method to similar ISSB quantitative items.

9. Question 9

   Q9. Average of 1, 4, 7, 10, 13, 16?

   • A) 8
   • B) 8.5
   • C) 9
   • D) 9.5

   Answer: 8.5

   Explanation: Sum 51 divided by 6 equals 8.5. Work each step carefully; ISSB math rewards accuracy under time pressure.

10. Question 10

    Q10. Average of 11, 15, 19, 23, 27?

    • A) 17
    • B) 18
    • C) 19
    • D) 20

    Answer: 19

    Explanation: Sum 95 divided by 5 equals 19. Work each step carefully; ISSB math rewards accuracy under time pressure.

11. Question 11

    Q11. Sum of first 12 natural numbers?

    • A) 66
    • B) 72
    • C) 78
    • D) 84

    Answer: 78

    Explanation: Formula n(n+1)/2 gives 12 times 13 divided by 2 equals 78. Work each step carefully; ISSB math rewards accuracy under time pressure.

12. Question 12

    Q12. Median of 6, 10, 14, 18, 22?

    • A) 12
    • B) 14
    • C) 16
    • D) 18

    Answer: 14

    Explanation: Middle value in sorted list of five numbers is 14. Work each step carefully; ISSB math rewards accuracy under time pressure.

13. Question 13

    Q13. Average of squares of 3, 5, 7?

    • A) 27
    • B) 83/3
    • C) 28
    • D) 30

    Answer: 83/3

    Explanation: Squares 9,25,49 sum 83 divided by 3 equals 83/3. Work each step carefully; ISSB math rewards accuracy under time pressure.

14. Question 14

    Q14. Average of 6, 12, 18, 24?

    • A) 13
    • B) 14
    • C) 15
    • D) 16

    Answer: 15

    Explanation: Sum is 60 divided by 4 numbers gives average 15. Work each step carefully; ISSB math rewards accuracy under time pressure.

15. Question 15

    Q15. Average of 5, 10, 15, 20, 25?

    • A) 14
    • B) 15
    • C) 16
    • D) 17

    Answer: 15

    Explanation: Sum 75 divided by 5 equals 15. Work each step carefully; ISSB math rewards accuracy under time pressure.

16. Question 16

    Q16. Average of 10 numbers is 25. Sum?

    • A) 230
    • B) 240
    • C) 250
    • D) 260

    Answer: 250

    Explanation: Sum equals average times count so 25 times 10 is 250. Work each step carefully; ISSB math rewards accuracy under time pressure.

17. Question 17

    Q17. Mean of 8, 14, 20, 26, 32?

    • A) 18
    • B) 19
    • C) 20
    • D) 21

    Answer: 20

    Explanation: Sum 100 divided by 5 equals 20. Work each step carefully; ISSB math rewards accuracy under time pressure.

18. Question 18

    Q18. Median of 3, 7, 11, 15, 19?

    • A) 9
    • B) 10
    • C) 11
    • D) 12

    Answer: 11

    Explanation: Middle value in sorted list of five numbers is 11. Work each step carefully; ISSB math rewards accuracy under time pressure.

19. Question 19

    Q19. Average of 2, 5, 8, 11, 14, 17?

    • A) 8
    • B) 9
    • C) 10
    • D) 11

    Answer: 9

    Explanation: Sum 57 divided by 6 equals 9.5, closest 9. Work each step carefully; ISSB math rewards accuracy under time pressure.

20. Question 20

    Q20. Weighted average: 3 items avg 10, 7 items avg 20?

    • A) 16
    • B) 17
    • C) 18
    • D) 19

    Answer: 17

    Explanation: Total sum 30 plus 140 divided by 10 items equals 17. Work each step carefully; ISSB math rewards accuracy under time pressure.