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Question: Identify the discrepancy in the frequency distribution.
ClassFrequency
15 - 192
19 - 233
23 - 271
27 - 316
31 - 354


A ) The class width should be more than 5 and it should be an odd number.
B ) The class width should be more that 5, the classes must be mutually exclusive.
C ) The class width should be an odd number, the classes must be mutually exclusive.
D ) The upper and lower class limits should be even numbers, the class width should be an odd number.

Steps to derive

1 Class width = lower class limit of one class - lower class limit of next class = 19 - 15 = 4, which is an even number

2 The class width should be an odd number.
 [Rule.]

3 The classes should have non overlapping class limits so that the data cannot be placed into two classes.

4 So, the class width should be an odd number and the classes must be mutually exclusive.



Hence the right answer is Option C

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