The harmonic mean of the numbers 3, 6, 9 is: MCQ with Answer and Explanation
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Question #1
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In a pie chart, the angle of a sector for a category with frequency 30 out of total 120 is:
Correct Answer: Option D
Explanation:
Angle = (30/120) × 360 = 90°.
Angle = (30/120) × 360 = 90°.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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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:
Correct Answer: Option A
Explanation:
P(at least one) = 1 - P(both fail) = 1 - (0.2×0.3) = 1 - 0.06 = 0.94.
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
Question #3
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Which sampling method is MOST appropriate for collecting primary data from a heterogeneous population with distinct subgroups?
Correct Answer: Option C
Explanation:
Stratified sampling divides the population into homogeneous subgroups (strata) and samples from each, ensuring representation of all key segments and improving precision for subgroup analysis.
Stratified sampling divides the population into homogeneous subgroups (strata) and samples from each, ensuring representation of all key segments and improving precision for subgroup analysis.
This question belongs to:
Accountancy and Statistics
Statistics
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