A certain snack vending machine dispenses the incorrect item, on average, 4.2 times every day. Assume that the number of incorrect items dispensed on any given day, *X, *is a Poisson random variable.

What is the probability that the machine will dispense exactly 9 incorrect items tomorrow? ANSWER: *(Use only the appropriate formula and/or statistical table in your textbook to answer this question. **Report your answer as to 4 decimal places, using conventional rounding rules)*

What is the standard deviation of this probability distribution? ANSWER: *(Use only the appropriate formula and/or statistical table in your textbook to answer this question. **Report your answer as to 4 decimal places, using conventional rounding rules)*

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