If a population has a crude birth rate of 30 and crude death rate of 10 per 1000, the natural increase rate (per 1000) is: MCQ with Answer and Explanation

Explanation:
ASFR = (Births to women in age group / Women in age group) × 1,000. An ASFR of 100 means 100 annual births per 1,000 women aged 30-34, reflecting age-specific fertility behavior.

Explanation:
HM = 2 / (1/2 + 1/6) = 2 / (4/6) = 3.

Explanation:
By the addition rule, P(A∪B) ≤ P(A)+P(B), and probability of any event is ≤1.