A random variable X takes values 0,1,2 with probabilities 0.3,0.5,0.2. The expected value E(X) is: MCQ with Answer and Explanation

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A random variable X takes values 0,1,2 with probabilities 0.3,0.5,0.2. The expected value E(X) is:

A. 0.8

B. 1.1

C. 0.9

D. 1.0

Answer: Option C

Solution (By JKSSB Mock Tests)

E(X) = 0×0.3 + 1×0.5 + 2×0.2 = 0 + 0.5 + 0.4 = 0.9.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

The Laspeyres quantity index uses:

A. Base period prices as weights

B. Current period prices as weights

C. Base period quantities as weights

D. Current period quantities as weights

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Correct Answer: Option A

Explanation:
Laspeyres quantity index = Σp₀q₁ / Σp₀q₀ × 100.

This question belongs to: Accountancy and Statistics Statistics

Question #2

A random experiment has outcomes that are:

A. Impossible to list

B. Uncertain but with known possible outcomes

C. Always equally likely

D. Predictable with certainty

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Correct Answer: Option B

Explanation:
In a random experiment, individual outcomes are uncertain, but the set of all possible outcomes is known.

This question belongs to: Accountancy and Statistics Statistics

Question #3

In the theory of attributes, the class frequency (Aβ) represents:

A. Number not possessing A but possessing B

B. Number possessing neither

C. Number possessing A but not B

D. Number possessing A and B

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Correct Answer: Option C

Explanation:
β indicates absence of B; (Aβ) = items with A and without B.

This question belongs to: Accountancy and Statistics Statistics

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