The Harmonic Mean of 2 and 4 is: MCQ with Answer and Explanation

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The Harmonic Mean of 2 and 4 is:

A. 3

B. 2.67

C. 2.83

D. 3.5

Answer: Option B

Solution (By JKSSB Mock Tests)

HM = 2ab / (a+b) = 2(2)(4) / (2+4) = 16/6 = 2.67.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If P(A) = 0.2 and P(B) = 0.3, and A, B are mutually exclusive, P(A∪B) is:

A. 0.8

B. 0.1

C. 0.5

D. 0.06

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Correct Answer: Option C

Explanation:
For mutually exclusive events, P(A∪B) = P(A) + P(B) = 0.5.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Assertion (A): The geometric mean is always less than or equal to the arithmetic mean for positive numbers. Reason (R): Because geometric mean is a measure of central tendency.

A. Both A and R true, and R is correct explanation of A

B. A false, R true

C. Both A and R true, but R is not correct explanation

D. A true, R false

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Correct Answer: Option C

Explanation:
The inequality AM ≥ GM is a mathematical truth; the reason given does not explain why it holds.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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In a class of 100 students, 60 play cricket, 50 play football, and 30 play both. Probability a random student plays neither is:

A. 0.4

B. 0.1

C. 0.3

D. 0.2

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Correct Answer: Option D

Explanation:
P(C∪F) = 60+50-30 = 80. Playing neither = 100 - 80 = 20; probability = 20/100 = 0.2.

This question belongs to: Accountancy and Statistics Statistics

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