B. No calculated class frequency is negative, as negative frequencies are impossible
C. All class frequencies are positive integers
D. The sum of all frequencies equals the sample size
Answer: Option B
Solution (By JKSSB Mock Tests)
Consistency requires that all derived class frequencies (including ultimate classes) are non-negative, as negative counts are logically impossible in real-world data.
Explanation:
CBR uses total population in the denominator, so populations with more women of reproductive age will have higher CBR even if age-specific fertility is identical, limiting comparability.
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