(Answered) Question on average how many years would you expect a

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Question: On average, how many years would you expect a physics major to spend doing post-graduate research? Use the following information to answer the next seven exercises: A ballet instructor is interested in knowing what percent of each year's class will continue on to the next, so that she can plan what classes to offer. Over the years, she has established the following probability distribution.

- Let X = the number of years a student will study ballet with the teacher.

- Let P(x) = the probability that a student will study ballet x years.

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