Consider the given data set: 45, 43, 20, 34, 27, 20, 48, 27, 19, 45, 24, 36, 37, 44, 40, 46, 46, 45, 48, 37, 33, 43, 22, 45, 29, 25, 47, 41. How many classes are needed to construct a histogram for this data?