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Question

Below given is the pulse count of 40 patients.
66, 79, 89, 67, 72, 82, 85, 80, 82, 81, 67, 87, 71, 68, 63, 74, 73, 86, 84, 75, 85, 80, 85, 61, 75, 85, 80, 85, 61, 75, 68, 69, 64, 75, 73, 72, 82, 76, 74, 77.
Group the data first in discontinuous class intervals such that one of the class intervals is 70-74.
Next, group the data in continuous class intervals such that one of the class intervals is 85-90.
Find the second class interval and the corresponding frequency of the class for both the groupings of the data.


A
64-69, 6, 65-70, 6
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B
65-69, 6, 65-70, 6
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C
65-69, 6, 65-70, 7
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D
65-70, 6, 65-70, 6
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Solution

The correct option is C 65-69, 6, 65-70, 6
Discontinuous class intervals
Class intervalFrequency606446569670747757978084885898
Continuous class intervals
Class intervalFrequency616546570671757758078185885908

From the frequency distribution tables, it can be inferred that,

The second class interval for the discontinuous frequency distribution table is 65 - 69 and the corresponding frequency of the class is 6.

While the second class interval for the continuous frequency distribution table is 65 - 70 and the corresponding frequency of the class is 6.
 

Mathematics

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