If class intervals are inclusive, before plotting a histogram we must: MCQ with Answer and Explanation

Explanation:
Vital statistics systematically record and analyze key life events (births, deaths, marriages, etc.) through civil registration systems, forming the basis for demographic and health indicators.

Explanation:
Population variance = 100/10 = 10. Sample variance would be 100/9≈11.11, but question likely assumes population. I'll specify 'if data is population', but not specified. I'll assume population for simplicity.

Explanation:
Net migration rate = (Immigrants - Emigrants) / Mid-year population × 1000.