1.

1). 42 kg2). 43.6 kg3). 45 kg4). 49 kg

Answer»

As per given data -

Average weights of three CLASSES of 58, 56 & 59 students respectively is 45, 50, 52 kg.

Total weights of students = $(\sum \left( {average\;weight\; \times \;NUMBER\;of\;students\;of\;each\;class} \right))$

Total weights of students = 58 × 45 + 56 × 50 + 59 × 52

Total weights of students = 2610 + 2800 + 3068

Total weights of students = 8478

Here total number of students = 58 + 56 + 59

Total number of students = 173

Average weight of students = Total weight/Number of students

Average weight of students = 8478/173 = 49.005



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