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In a class, the average weight of 12 students is 46.25 kg and that of the remaining 18 students is 48.15 kg. The average weight of all the students in the class is
1. 47.48 kg
2. 47.12 kg
3. 47.69 kg
4. 47.39 kg

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Correct Answer - Option 4 : 47.39 kg

Given 

Average weight of 12 students = 46.25 kg 

Average weight of 18 students = 48.15 kg

Formula Used 

Average = Sum of Data/Number of Data 

Calculation 

Average of 30 students = [(12 × 46.25) + (18 × 48.15)]/30 

⇒ (555 + 866.7)/30 = 47.39 kg

∴ The average weight of all students in the class is 47.39 kg

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