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Question #1
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Which property of the arithmetic mean states that the sum of deviations from the mean is always zero?
Correct Answer: Option D
Explanation:
The sum of deviations of all observations from their arithmetic mean is always zero, i.e., Σ(x - x̄) = 0, which is a fundamental algebraic property of the mean.
The sum of deviations of all observations from their arithmetic mean is always zero, i.e., Σ(x - x̄) = 0, which is a fundamental algebraic property of the mean.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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If the events A and B are independent, P(A)=0.4, P(B)=0.5, then P(A'∩B') is:
Correct Answer: Option A
Explanation:
P(A')=0.6, P(B')=0.5, independence gives 0.6×0.5=0.3.
P(A')=0.6, P(B')=0.5, independence gives 0.6×0.5=0.3.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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If the Arithmetic Mean is 50 and the number of items is 10, the sum of all items is:
Correct Answer: Option D
Explanation:
Sum = Mean × N = 50 × 10 = 500.
Sum = Mean × N = 50 × 10 = 500.
This question belongs to:
Accountancy and Statistics
Statistics
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