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Q.

A grouped frequency table with class intervals of equal sizes using 250-270 (270 not included) as one of the class intervals is constructed for the following data.


268, 220, 368, 258, 242, 310, 272, 342, 310, 290, 300, 320, 319, 304, 402, 318, 406, 292, 354, 278, 210, 240, 330, 316, 406, 215, 258, 236.


Find the frequency of the class 310-330.


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a

5

b

6

c

7

d

10 

answer is B.

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Detailed Solution

The following data is given.
268, 220, 368, 258, 242, 310, 272, 342, 310, 290, 300, 320, 319, 304, 402, 318, 406, 292, 354, 278, 210, 240, 330, 316, 406, 215, 258, 236.
We have to find the frequency of the data 310 – 330.
In a grouped frequency table, frequency is the number of terms in the class interval.
The frequency table of the distribution is given by,
Question ImageFrom the table, the frequency of the class interval 310 – 330 is 6.
Hence, option 2 is correct.
 
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