Answer to Question #332050 in MathCAD for Nishi

Question #332050

1.    Two fair cubes are rolled. The random variable X represents the difference between the values of the two cubes.

 

a)    Find the mean of this probability distribution. (i.e. Find E[X])

b)    Find the variance and standard deviation of this probability distribution.

(i.e. Find V[X] and SD[X])

The random variables A and B are defined as follows:

A = X-10 and B = [(1/2) X]-5

c) Show that E[A] and E[B].

d) Find V[A] and V[B].

e) Arnold and Brian play a game using two fair cubes. The cubes are rolled, and Arnold records his score using the random variable A and Brian uses the random variable B. They repeat this for a large number of times and compare their scores. Comment on any likely differences or similarities of their scores.



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