Selected MCQ

Current Question
The average weight of 8 persons increases by 2 kg when a new person joins. What is the weight of the new person?
  • A. 70 kg
  • B. 72 kg
  • C. 74 kg
  • D. 76 kg
Correct Answer: D
Explanation:
Increase = 16 ⇒ new person = 76 kg.
Related Question 1
Three persons invest Rs. 9000. Second invests Rs. 3000. Profit share of first is ____.
  • A. Rs. 2400
  • B. Rs. 3600
  • C. Rs. 2850
  • D. Rs. 2000
Correct Answer: A
Explanation:
Profit shares are proportional to investment.
Related Question 2
If a person travels half distance at 40 km/h and half at 60 km/h, average speed is ____.
  • A. 48 km/h
  • B. 50 km/h
  • C. 52 km/h
  • D. 55 km/h
Correct Answer: A
Explanation:
Harmonic mean = 48 km/h.
Related Question 3
A person covers a distance at 40 km/h and returns at 60 km/h. Average speed is ____.
  • A. 48 km/h
  • B. 50 km/h
  • C. 45 km/h
  • D. 52 km/h
Correct Answer: A
Explanation:
Average = 2ab/(a+b) = 48 km/h.
Related Question 4
Out of 10 persons, 4 are graduates. Probability that at least one is graduate when 3 are chosen is ____.
  • A. 1/6
  • B. 5/8
  • C. 3/8
  • D. 5/6
Correct Answer: D
Explanation:
Use the complement method → 1 − (6C3/10C3).
Related Question 5
A wholesaler has three lots of goods. What is the average weight?
  • A. 50
  • B. 36
  • C. 24
  • D. 12
Correct Answer: D
Explanation:
Weighted average calculation.