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cloud360
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Homework Statement
In the game of Risk, battles are decided by the rolling of dice. Suppose that there are two armies,
red and blue. The red army rolls three dice and the blue army rolls two dice. Whichever army rolls
the highest number (on a single die) is declared the winner. In the event of a tie (both armies have
the same highest number), the blue army is declared the winner.
(a) Let X denote the highest number rolled by the red army. Find the probability mass function
of X.
(b) Let Y denote the highest number rolled by the blue army. Find the probability mass function
of Y .
(c) Calculate the probability that the red army wins.
Homework Equations
pmf = px(s), where s= number of times you want variable x to appear, the function represent the probability of this
cdf= fx(s), where this represent probability x is less than or equal to s
The Attempt at a Solution
Red army rolls 3 times
Blue army rolls 2 times.
Red army
x1=1st die thrown =1,2,3,4,5,6
x2=2nd die thrown=1,2,3,4,5,6
x3=3rd die thrown=1,2,3,4,5,6
Px(x)=Fx(x)^3
is this correct, i don't know why you do this. but i think you must do this, then create a PMF (probability mass function) table?
Why is the pmf function = to Fx(x)^3, this is what i saw in my teachers explanation. but his explanation wasn't... perfect
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