Average

JKSSB Sub-Inspector (Telecommunication) · Basic Numeracy · 38 practice questions with answers and explanations: 13 Easy, 14 Medium, 11 Hard.

Sample questions

Sample Easy question 1

Find the average of 10, 11, 12, 13 and 14.

  1. 11
  2. 12
  3. 13
  4. 14
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Answer: B. Sum = 60, average = 60/5 = 12.

Sample Medium question 2

A class of 20 students has an average score of 60. Another class of 30 students has an average score of 70. Find the combined average.

  1. 64
  2. 65
  3. 66
  4. 67
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Answer: C. Combined total = 20×60 + 30×70 = 1200+2100 = 3300. Combined average = 3300/50 = 66.

Sample Hard question 3

The average age of a family of 5 members is 24 years. The youngest member is 8 years old. What was the average age of the family at the time of the youngest member's birth?

  1. 18
  2. 19
  3. 20
  4. 21
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Answer: C. Current sum = 120. 8 years ago, the other 4 members' combined age was (120-8) - 4×8 = 80, giving an average of 20.

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