The weights (in kg) of 15 students of a class are: 38,42,35,37,45,50,32,43,43,40,36,38,43,38,47. : Is there more than one mode?

The marks of 30 students of a class of 10 in a test (out of 75) are given below 40, 21, 50, 37, 42, 37, 38, 42, 49, 52, 38, 53, 57, 47, 29, 59, 61, 33, 17, 17, 39, 44, 42, 39, 14, 7, 27, 19, 54, 51. Form a frequency table with equal class intervals.