luisnorth
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A Levels Maths Quiz on Discrete Random Variables quick quiz, created by luisnorth on 12/02/2014.

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Discrete Random Variables quick quiz

Question 1 of 4

1

X~B(10,0.5)

E(X)=

Select one of the following:

  • 0.1

  • 0.5

  • 2.5

Explanation

Question 2 of 4

1

X~Geo(0.5)

P(X=0) = 1

Select one of the following:

  • True
  • False

Explanation

Question 3 of 4

1

A bag contains 5 white rabbits and 8 black rabbits. As part of a magic trick, two are removed at the same time. What is the probability they are both white?

Select one of the following:

  • 14/39

  • 20/39

  • 1

  • 20/169

  • 0

  • 5/39

Explanation

Question 4 of 4

1

X~Geo(p)

E(x) = ?

Select one of the following:

  • 1/p

  • (1-p)^x-1 * p

  • np

  • Σ(x^2 * p) - μ^2

Explanation

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