Your econ professor is considering adding a side hustle of being a yoga instructor on top of teaching. The mean earnings for a teaching econ professor is $75,000, and the mean earnings of a part time yoga instructor is $15,000. The correlation between econ and yoga earnings is 0.85. Let W represent the total wealth earned from being an econ professor and yoga instructor. 18. What is the expected total wealth of an econ professor who also teaches yoga? 19. What is the covariance between an econ professor earning and a yoga teacher earning? 20. What is the standard deviation of W?

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