Let X represent the number of tires with low air pressure on a randomly chosen car.
a. Which of the three functions below is a possible probability mass function of X? Explain.
b. For the possible probability mass function, compute 
and 
.
(a)
is the only probability mass function, because it is the only one whose probabilities sum to 1.
(b) 
= 0(0.1) + 1(0.2) + 2(0.4) + 3(0.2) + 4(0.1) = 2.0,
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