Five electronics shops have 20, 30, 60, 80, and 50 TV sets respectively. What is the average number of TV sets per shop?
Aptitude
Average
Difficulty: Easy
Choose an option
Answer
Correct Answer: 48
Explanation
Introduction / Context:Average inventory questions test straightforward mean computation. Keeping track of totals and counts is the central skill.
Given Data / Assumptions:
- TV sets: 20, 30, 60, 80, 50
- Number of shops = 5
Concept / Approach:Average = total units / number of shops. Grouping numbers helps reduce mistakes during addition.
Step-by-Step Solution:
Sum = 20 + 30 + 60 + 80 + 50 Pairing: (20 + 80) = 100; (30 + 50) = 80; remaining 60 Total = 100 + 80 + 60 = 240 Average = 240 / 5 = 48Verification / Alternative check:The mean 48 is close to the middle values and balances the distribution between low (20, 30) and high (60, 80) counts, confirming reasonableness.
Why Other Options Are Wrong:
- 24: Exactly half the correct value; likely divided by 10 by mistake.
- 50 and 60: Above the computed mean; not supported by the totals.
- None of these: A correct option (48) exists.
Common Pitfalls:Arithmetic slips when multiple terms are added, or dividing by the wrong count of shops.
Final Answer:48