Questions
A grouped frequency distribution table with classes of equal sizes using 63- 72 (72 included) as one of the class is constructed for the following data.
30, 32, 45, 54, 74, 78, 108, 112, 66, 76, 88, 40, 14, 20, 15, 35, 44, 66, 75, 84, 95, 96, 102, 110, 88, 74, 112, 14, 34, 44
What will be the number of classes in the distribution?
detailed solution
Correct option is B
Given one of the class interval is 63-72. Therefore the class width is 9.
According to the data, the lowest number given is 14 and the highest number given is 112. Therefore the frequency distribution is
Class interval | Frequency |
13-22 | 4 |
23-32 | 2 |
33-42 | 3 |
43-52 | 3 |
53-62 | 1 |
63-72 | 2 |
73-82 | 5 |
83-92 | 3 |
93-102 | 3 |
103-112 | 4 |
Therefore the number of class intervals is 10.
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