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Questions › JNU › JNU SIS 2013 › Q13
4 marks, −1Statistics › Random variables and standard distributions › Expectation and varianceModerateabout 2 min

JNU SIS 2013 Question 13: Random variables and standard distributions

A card is selected at random from an ordinary deck of cards. If an ace is drawn, you win Rs 100; if a king is drawn, you win Rs 75; if a queen is drawn, you win Rs 50; and if a jack is drawn, you win Rs 25. What is the probability of winning at least Rs 25? What would you expect to win on average?

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A card is selected at random from an ordinary deck of cards. If an ace is drawn, you win Rs 100; if a king is drawn, you win Rs 75; if a queen is drawn, you win Rs 50; and if a jack is drawn, you win Rs 25. What is the probability of winning at least Rs 25? What would you expect to win on average? (A) 1/4; Rs 62· 50 (B) 4/13; Rs 62· 50 (C) 1/13; Rs 19· 23 (D) 4/13; Rs 19· 23

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 SIS 2013 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.