If the probability of a student passing an exam is 0.8 and the probability of another student passing is 0.7, and these events are independent, the probability that at least one passes is: MCQ with Answer and Explanation

Question

If the probability of a student passing an exam is 0.8 and the probability of another student passing is 0.7, and these events are independent, the probability that at least one passes is:

A. 0.94

B. 0.5

C. 0.56

D. 1.5

Answer: Option A

Solution (By JKSSB Mock Tests)

P(at least one) = 1 - P(both fail) = 1 - (0.2×0.3) = 1 - 0.06 = 0.94.

This question belongs to: Accountancy and Statistics Statistics

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The weighted mean is used when:

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B. Data are symmetric

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Correct Answer: Option D

Explanation:
Weights reflect relative importance of each item.

This question belongs to: Accountancy and Statistics Statistics

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Neonatal mortality rate is a subset of:

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If a variable can take only integer values, the data is:

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Correct Answer: Option B

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