CA Foundation · Quantitative Aptitude · Statistical Description of Data
A distribution has class intervals of equal width. The first class is 25–35 and there are 6 classes in all. What is the lower limit of the last class (exclusive method)?
The lower limit of the last class is 75. The class width is 10, so the six classes start at 25, 35, 45, 55, 65 and 75, and the sixth class is 75–85.
- A75Correct
- B85
- C65
- D95
Explanation
Class width = 35 − 25 = 10. The lower limits are 25, 35, 45, 55, 65 and 75 for the 1st to 6th classes. The last class is 75–85. The value 85 is its upper limit, not the lower limit.
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