A tour guide is in charge of overseeing groups of 3 visitors during the trip. There is a probability of 2/3 that a visitor in the group will ask the tour guide a question. The tour guide has been asked by the bus driver to make a hypothesis about the number of questions the next group will ask. 1. Write the table and formula (if any) of the probability mass function for the number of questions asked by the group of 3. 2. How many questions should the tour guide expect, and what is the standard deviation?

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A tour guide is in charge of overseeing groups of 3 visitors during the trip. There is a probability of 2/3 that a visitor in the group will ask the tour guide a question. The tour guide has been asked by the bus driver to make a hypothesis about the number of questions the next group will ask.

1. Write the table and formula (if any) of the probability mass function for the number of questions asked by the group of 3.
2. How many questions should the tour guide expect, and what is the standard deviation?

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