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

Question

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

A. 90/100 × 89/99

B. 89/110

C. 1 - (10/100)²

D. (90/100)²

Answer: Option A

Solution (By JKSSB Mock Tests)

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

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The concept of 'conditional probability' is needed when:

A. We want the probability of an event given that another event has already occurred

B. We sum probabilities

C. Events are independent

D. Events are mutually exclusive

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Correct Answer: Option A

Explanation:
Conditional probability deals with the updated probability after knowing another event has occurred.

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Question #2

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When data is classified according to time (e.g., years, months, weeks), it is called:

A. Discrete classification

B. Chronological classification

C. Conditional classification

D. Geographical classification

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Correct Answer: Option B

Explanation:
Chronological classification arranges data in order of time, forming a time series.

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Question #3

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Which index number formula uses the unweighted geometric mean of price relatives?

A. Fisher

B. Paasche

C. Laspeyres

D. Jevons

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Correct Answer: Option D

Explanation:
The Jevons index is the geometric mean of the price relatives, giving equal weight to each item.

This question belongs to: Accountancy and Statistics Statistics

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