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Q.

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?

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a

11

b

12

c

10

d

9

answer is B.

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Detailed Solution

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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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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, 44What will be the number of classes in the distribution?