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[solution] » (b) Use the results of part (a) to compute the sample mean, variance, and standard deviation for 

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(b) Use the results of part (a) to compute the sample mean, variance, and standard deviation for x and for y. (Round your answers to two decimal places.)

x y
x
s2
s

Here was the first part of that question with your solution:

Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for Vanguard Total Stock Index (all stocks). Let y be a random variable representing annual return for Vanguard Balanced Index (60% stock and 40% bond). For the past several years, we have the following data.
x: 37

 


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