If the probability that a student passes Mathematics is 0.7, passes English is 0.6, and passes both is 0.4, what is the probability that the student passes at least one subject? MCQ with Answer and Explanation
If the probability that a student passes Mathematics is 0.7, passes English is 0.6, and passes both is 0.4, what is the probability that the student passes at least one subject?
A. 0.9
B. 0.8
C. 0.7
D. 1.0
Answer: Option A
Solution (By JKSSB Mock Tests)
P(Math ∪ English) = P(Math) + P(English) - P(both) = 0.7 + 0.6 - 0.4 = 0.9. This uses the addition theorem to avoid double-counting students who pass both.
Consider the following statements: 1. Weighted mean considers the relative importance of different items. 2. Combined mean depends on group sizes and group means. 3. Arithmetic mean is always the best measure for skewed data. Which is/are correct?
A questionnaire includes the question: 'Don't you agree that government policies have improved rural healthcare?' This question violates which design principle?
A.Ensuring questions are answerable by all respondents
B.Mutually exclusive response options
C.Maintaining neutrality and avoiding leading questions
Explanation:
The question is leading because it presupposes agreement and pressures respondents toward a positive response, violating the principle of neutrality in questionnaire design.
No comments yet. Be the first to start the discussion!