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a. P(9) Probability of exactly 9 occurrencesIf using a calculator, you can enter lambda=6.8 and x=9 into a poisson probability distribution function (PDF). If doing this by hand, apply the poisson probability formula:P(x)=(e^(-lambda)*lambda^(x))/(x!)where x is the number of occurrences, lambda is the mean number of occurrences, and e is the constant 2.718. Substituting in values for this problem, x=9 and lambda=6.8, we haveP(9)=(e^(-6.8)*6.8^(9))/(9!)Evaluating the expression, we haveP(9)=0.095414571562836 & ... See the full answer