A frequency distribution has classes 0-10, 10-20, 20-30, 30-40. The median class is 20-30 and the cumulative frequency before this class is 30. If N=80, frequency of median class is 20. The median is:
Explanation:
Censuses are periodic (e.g., decennial) and not designed for real-time vital event tracking; continuous registration systems (e.g., civil registration) handle daily birth/death recording.
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