The average weight of a family of five members whose weights are 40 kg, 49 kg,…
2026
The average weight of a family of five members whose weights are 40 kg, 49 kg, 57 kg, 76 kg, and 36 kg is:
Answer: B. 51.6 kg — ConceptThe arithmetic mean of equally weighted observations is their total divided by the number of observations. It is the single value that preserves the…
- A.
52.6 kg
- B.
51.6 kg
- C.
50.6 kg
- D.
53.6 kg
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Show answer & explanation
Correct answer: B
Concept
The arithmetic mean of equally weighted observations is their total divided by the number of observations.
It is the single value that preserves the same total when assigned to every observation.
Application
The number of family members is 5.
The total weight is 40 + 49 + 57 + 76 + 36 = 258 kg.
The average weight is 258 ÷ 5 = 51.6 kg.
Cross-check
Multiplying 51.6 kg by 5 gives 258 kg, which matches the original total.
Therefore, the average weight is 51.6 kg.