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

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:
A. 2
B. 3
C. 40
D. 20
Answer: Option D
Solution (By JKSSB Mock Tests)
Rate of natural increase = CBR - CDR = 30 - 10 = 20 per 1000.

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Practice More Statistics Questions

Question #1
Age-Specific Fertility Rate for 30-34 years is 100 per 1,000 women. This implies that:
A. 10% of women in this age group give birth annually
B. For every 1,000 women aged 30-34, there are 100 live births in a year
C. This age group contributes 100 to the TFR
D. Women in this group have 100 children on average

Correct Answer: Option B


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.

This question belongs to: Accountancy and Statistics Statistics
Question #2
The harmonic mean of 2 and 6 is:
A. 4
B. 3.6
C. 3
D. 2.4

Correct Answer: Option C


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

This question belongs to: Accountancy and Statistics Statistics
Question #3
For any two events A and B, P(A∪B) is:
A. Always ≤ 1
B. Always ≤ P(A) + P(B)
C. Both A and B
D. Always ≥ P(A∩B)

Correct Answer: Option C


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

This question belongs to: Accountancy and Statistics Statistics