General fertility rate (GFR) is defined as: MCQ with Answer and Explanation

Explanation:
Using the rule of 70 or simple approximation: Growth rate ≈ [(Final/Initial)^(1/t) - 1] × 100 = [(55/50)^(0.1) - 1] × 100 ≈ (1.1^0.1 - 1)×100 ≈ (1.0096 - 1)×100 ≈ 0.96% ≈ 1.0% per annum.

Explanation:
It relates children 0-4 to women 15-49, approximating fertility.

Explanation:
Correct sum = 15 × 40 - 32 + 23 = 600 - 9 = 591. Correct mean = 591/15 = 39.4.