Discrete Random Variables
A clothing store has 4 changing rooms. You and a friend decide to do some shopping at the clothing store on a Thursday at noon. You each find items you wish to try on.
Let
x
be the random number of open or unoccupied changing rooms on a typical weekday at noon.
Suppose the table below gives the probability distribution of
x
.
\table[[Value of
x
,0,1,2,3,4],[Probability,0.05,0.10,0.25,0.40,0.20]]
3
0.7 points
What is the chance that you and your friend will both get separate changing rooms without either of you having to wait?
Since the values of
x
which require no waiting for either you or your friend are all 2 or more, we seek:
P(x>=2)
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