SOLUTION: 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 vari

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.
-----------
Values of the random variable: 1,2,3,4
Probability of each value is 1/4
-----------
Mean = (1/4)(1+2+3+4)= 5/2 = 2.5
Variance = 1.118^2 = 1.249924...
=============
Cheers,
Stan H.
RELATED QUESTIONS
Two tetrahedral dice, with faces labelled 1, 2, 3, 4 are thrown and the number on which... (answered by edjones)

A biased tetrahedral die with faces labelled 1,2,3 and 4 is rolled once. The chance of... (answered by robertb)

A biased tetrahedral die with faces labelled 1,2,3 and 4 is rolled once. The chance of... (answered by ewatrrr)

What is the theoretical probability of rolling an odd number on a fair die with six... (answered by ewatrrr)

a tetrahedral die has numbers 1,2,3 and 4 marked on its faces.when such a die is thrown... (answered by josgarithmetic)

An unfair die has a 1/4 chance of scoring 6. This unfair die is thrown with a fair die.... (answered by Boreal)

My problem is: The question is, A fair, 6-sided die has faces numered 1,2,3,4,5 and 6... (answered by stanbon)

A dice is a form of a tetrahedron and each spaces are marked 1,2,3,4. The score is the... (answered by ikleyn)