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.
x
0 1 2 3 4
p1(x) 0.2 0.2 0.3 0.1 0.1
p2(x) 0.1 0.3 0.3 0.2 0.2
p3(x) 0.1 0.2 0.4 0.2 0.1
b. For the possible probability mass function, compute ?x and ?x2.
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