A grouped frequency distribution table with classes of equal sizes usi

1.	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.The number of classes in the distribution will be :(A) 9(B) 10(C) 11(D) 12
Answer» (B) 10 Explanation: According to the question, The given frequency varies from 14 to 112. So the class intervals are as follows: 13-22, 23-32, 33-42, 43-52, 53-62, 63-72, 73-82, 83-92, 93-102, 103-112. Number of class interval = 10. Hence, option (B) is the correct answer.

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.The number of classes in the distribution will be :(A) 9(B) 10(C) 11(D) 12

Answer»

(B) 10

Explanation:

According to the question,

The given frequency varies from 14 to 112.

So the class intervals are as follows:

13-22, 23-32, 33-42, 43-52, 53-62, 63-72, 73-82, 83-92, 93-102, 103-112.

Number of class interval = 10.

Hence, option (B) is the correct answer.

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