The weights of 30 children in a class, to the nearest kilogram, were as follows:

50, 45, 61, 53, 55, 47, 52, 49, 46, 51, 60, 52, 54, 47, 57, 59, 42, 46, 51, 53, 56, 48, 50, 51, 44, 52, 49, 58, 55, 45

Construct a grouped frequency table for these data such that there are five equal class intervals with the first class having a lower boundary of 41.5 kg and the fifth class having an upper boundary of 61.5 kg.