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Questions › JNU › JNU SSS 2011 › Q53
1 mark, −0.25Statistics › Random variables and standard distributions › Expectation and varianceModerateabout 2 min

JNU SSS 2011 Question 53: Random variables and standard distributions

The probability distribution of a random variable XXX is given in the table below :

XXXProbability
00·24
10·38
20·20
30·13
40·05
The mean and variance of XXX are respectively

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The probability distribution of a random variable X is given in the table below: | X | Probability | 0 | 0·24 | 1 | 0·38 | 2 | 0·20 | 3 | 0·13 | 4 | 0·05 | The mean and variance of X are respectively (A) 2; 2 (B) 2; 1·4142 (C) 1·37; 1·2731 (D) None of the above

Random variables and standard distributions has come up 173 times in 7 exams since 2005.

What this question tests

This question is on Expectation and variance, part of Random variables and standard distributions in Statistics.

The mean and spread of a random variable, and how they change under transformations and sums.

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Question from the JNU SSS 2011 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.