A traffic light at a certain intersection is green 50% of the time, yellow 10% of the time, and red 40% of the time. A car approaches this intersection once each day. Let Xrepresent the number of days that pass up to and including the first time the car encounters a red light. Assume that each day represents an independent trial.
a. Find P(X = 3).
b. Find P(X ? 3).
c. Find 
.
d. Find 
.
Let X be the number days that pass up to and including the first time the car encounters a red light. Then X Geom(0.4).
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