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Forty students in a form two class were weighed and their masses recorded to the nearest kilogram as shown below.
45 48 56 39 47 36 45 49 50 46
37 46 33 43 51 42 47 39 42 48
47 40 46 41 45 43 46 50 38 45
54 42 51 39 42 45 44 35 52 46
(a) Using class intervals of 5kg tabulate this data in a frequency table.
(b) Find the modal class.
(c) Modify the table and use it to calculate them mean mass of the students.