In a class there are 8, 10, 25 and 17 students having their weights in the following ranges: 50 - 54 kg, 54 - 58 kg, 58 - 62 kg and 62 - 66 kg, respectively. What is the mean weight of a student of the class? 

1
55.6 kg
2
56.5 kg
3
59.4 kg
4
60.2 kg

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