In a box of 100 bulbs, 10 are defective. Two bulbs are chosen at random. The probability that both are non-defective is: MCQ with Answer and Explanation

In a box of 100 bulbs, 10 are defective. Two bulbs are chosen at random. The probability that both are non-defective is:

A. 89/110

B. 1 - (10/100)²

C. 90/100 × 89/99

D. (90/100)²

Answer: Option C

P(first non-defective)=90/100, second non-defective=89/99, product.

This question belongs to: Accountancy and Statistics Statistics

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Question #1 Report Error

A frequency distribution that uses 'less than' or 'more than' type classes is called:

A. Simple frequency distribution

B. Cumulative frequency distribution

C. Grouped frequency distribution

D. Bivariate frequency distribution

Correct Answer: Option B

Explanation:
Cumulative frequency distributions sum frequencies up to a point or from a point.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

The dependency ratio measures the ratio of:

A. Rural to urban population

B. Female to male population

C. Non-working age population to working-age population

D. Unemployed to employed population

Correct Answer: Option C

Explanation:
Dependency ratio = (Population under 15 + Population over 65) / Population aged 15-64.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

Which of the following statements about crude birth rate (CBR) is true?

A. CBR includes only male births.

B. CBR is affected by the age structure of the population.

C. CBR is a refined measure of fertility.

D. CBR = (Total births / Total female population) × 1000

Correct Answer: Option B

Explanation:
CBR uses total population, so age composition influences it.

This question belongs to: Accountancy and Statistics Statistics