The crude birth rate and crude death rate of a country are 18 and 6 per 1000. The rate of natural increase is: MCQ with Answer and Explanation

Explanation:
A fundamental theorem of probability states that if A and B are independent, their complements A' and B' are also independent.

Explanation:
GRR sums age-specific fertility rates for female births only, measuring the average number of daughters per woman, which is crucial for analyzing female population replacement.

Explanation:
Class width (or class size) is the difference between the upper and lower boundaries of a class interval, determining the range of values grouped together in a frequency distribution.