- A82
- B37
- C41
- D45
Step-by-Step Solution
Old total = kg. New total = 240 + 47 = 287 kg over 7 boys. New mean = 287/7 = 41 kg.
Answer: C) 41
The mean weight of 6 boys is 40 kg. If a new boy of weight 47 kg joins them, what is the new mean weight (in kg)?
Class 7Data HandlingData Handling
Key idea: Mean — the 'fair share'
The **mean** is what each person would get if you redistributed everything evenly. Sum the values, divide by the count.
Example: marks 8, 6, 7, 9, 10. Sum = 40. Count = 5. Mean = 40 ÷ 5 = 8.
Mean is the most common 'average' but it can be pulled up or down by extreme values (one very high or very low number).
Example: marks 8, 6, 7, 9, 10. Sum = 40. Count = 5. Mean = 40 ÷ 5 = 8.
Mean is the most common 'average' but it can be pulled up or down by extreme values (one very high or very low number).
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