A bag contains 5 white and 3 black balls. Two balls are drawn without replacement. The probability that they are of different colors is: MCQ with Answer and Explanation

A bag contains 5 white and 3 black balls. Two balls are drawn without replacement. The probability that they are of different colors is:
A. 15/56
B. 30/56
C. 15/28
D. 30/28
Answer: Option C
Solution (By JKSSB Mock Tests)
P(different) = P(white then black) + P(black then white) = (5/8)(3/7) + (3/8)(5/7) = 15/56 + 15/56 = 30/56 = 15/28. This accounts for both orders of drawing.

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Practice More Statistics Questions

Question #1
Which of the following is NOT a demographic process?
A. Industrialization
B. Mortality
C. Fertility
D. Migration

Correct Answer: Option A


Explanation:
Demographic processes directly change population size and composition; industrialization is an economic process.

This question belongs to: Accountancy and Statistics Statistics
Question #2
If events A and B are independent, which of the following must be true?
A. P(A ∩ B) = 0
B. P(A|B) = P(A)
C. P(A) + P(B) = 1
D. A and B are mutually exclusive

Correct Answer: Option B


Explanation:
Independence means knowledge of B does not affect A's probability, so P(A|B) = P(A); this is equivalent to P(A∩B)=P(A)P(B).

This question belongs to: Accountancy and Statistics Statistics
Question #3
Crude Death Rate of 8 per 1,000 implies that in a population of 1 million, annual deaths are approximately:
A. 800
B. 8,000
C. 80,000
D. 800,000

Correct Answer: Option B


Explanation:
CDR = (Deaths / Population) × 1,000 → Deaths = (CDR × Population) / 1,000 = (8 × 1,000,000) / 1,000 = 8,000. Simple application of the rate formula.

This question belongs to: Accountancy and Statistics Statistics