Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for the Vanguard Total Stock Index (all Stocks). Let y be a random variable representing annual return for the Vanguard Balanced Index (60% stock and 40% bond). For the past several years, assume the following data. Compute a 75% Chebyshev interval around the mean for x-values and also for y-values. Round your answers to the nearest hundredth. 11 0 38 21 34 23 24 -11 -11 -21 7 -4 27 14 22 18 14 -4 -5 -7 O for x-values: -30.20 to 23.32 and for y-values: -16.84 to 20.72 O for x-values: -30.20 to 23.32 and for y-values: -4.32 to -14.24 O for x-values: -9.70 to 51.80 and for y-values: -4.32 to 33.24 O for x-values: -30.20 to 51.80 and for y-values: -16.84 to 33.24