Question 87652: For a throw of a fair tetrahedral die with its faces marked 1,2,3,4 respectively, the score X represents the number of the face which lands on the floor. Find the mean and the variance of X.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! For a throw of a fair tetrahedral die with its faces marked 1,2,3,4 respectively, the score X represents the number of the face which lands on the floor. Find the mean and the variance of X.
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Values of the random variable: 1,2,3,4
Probability of each value is 1/4
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Mean = (1/4)(1+2+3+4)= 5/2 = 2.5
Variance = 1.118^2 = 1.249924...
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Cheers,
Stan H.
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