Question: do bonds reduce the overall risk of an investment portfolio...

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:	26	0	26	32	23	29	32	−23	−15	−24
y:	9	−10	20	23	23	17	17	−8	−10	−7

a. 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-  s²   s

b. Compute a 75% Chebyshev interval around the mean for x values and also for y values. (Round your answers to two decimal places.)

	x	y
Lower Limit
Upper Limit

c.Compute the coefficient of variation for each fund. (Round your answers to the nearest whole number.)

	x	y
CV	%	%