A box contains 4 white and 6 black balls. A ball is drawn and not replaced. Then another ball is drawn. The probability that both are white is: MCQ with Answer and Explanation

Question

A box contains 4 white and 6 black balls. A ball is drawn and not replaced. Then another ball is drawn. The probability that both are white is:

A. 1/6

B. 6/90

C. 2/15

D. 12/90

Answer: Option C

Solution (By JKSSB Mock Tests)

(4/10)×(3/9)=12/90=2/15.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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A frequency distribution has classes 0-10, 10-20, 20-30, 30-40. The median class is 20-30 and the cumulative frequency before this class is 30. If N=80, frequency of median class is 20. The median is:

A. 25

B. 23

C. 24

D. 26

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Correct Answer: Option A

Explanation:
Median = L + (N/2 - cf)/f × h = 20 + (40-30)/20 × 10 = 20 + 10/20×10 = 20 + 5 = 25.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Combined mean formula is essential when:

A. Calculating mode

B. Data is qualitative

C. Merging means from groups of different sizes

D. All groups have the same size

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Correct Answer: Option C

Explanation:
Combined mean = (n₁x̄₁ + n₂x̄₂) / (n₁ + n₂) weights each group's mean by its size, providing the correct overall mean when aggregating subgroup statistics.

This question belongs to: Accountancy and Statistics Statistics