Weekly pocket expenses (in $) of 30 students of class VIII are
33, 41, 33, 32, 70, 26, 56, 61, 58, 79, 83, 72, 64, 39, 75, 39, 37,
59, 57, 37, 52, 32, 42, 43, 67, 81, 45, 35, 80, 74. Construct the
grouped frequency table with the class interval of equal width such
as 30 - 35. Also, find the range of the weekly pocket expenses.