Question: problems per car. (Data extracted from 2013 U.S. Vehicle Dependability Study, J.D. Power and Associates, February 13, 2013, bit.ly/101aR9l.) Let X be equal to the

problems per car. (Data extracted from “2013 U.S. Vehicle Dependability Study,” J.D. Power and Associates, February 13, 2013, bit.ly/101aR9l.) Let X be equal to the number of problems with a three-year-old Ford.

a. What assumptions must be made in order for X to be distributed as a Poisson random variable? Are these assumptions reasonable?

Making the assumptions as in (a), if you purchased a Ford in the 2010 model year, what is the probability that in the past 12 months, the car had

b. zero problems?

c. two or fewer problems?

d. Give an operational definition for problem. Why is the operational definition important in interpreting the initial quality score?

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