To compare the health conditions of two populations with entirely different age compositions, the most suitable mortality measure is the: MCQ with Answer and Explanation

Explanation:
A modern census requires universal coverage, simultaneous enumeration, and regular periodicity (usually 10 years).

Explanation:
Fisher's ideal index, being the geometric mean of Laspeyres and Paasche indices, is the only common formula that satisfies both time reversal and factor reversal tests, ensuring mathematical consistency.

Explanation:
For equal distances, average speed = total distance / total time = harmonic mean of speeds; arithmetic mean would overestimate if speeds vary.