Question: (a) Computex,x 2 ,y,y 2 . x x 2 y y 2 Do bonds reduce the overall risk of an investment portfolio? Letxbe a random

(a) Computex,x²,y,y².

x	x²
y	y²

Do bonds reduce the overall risk of an investment portfolio? Letxbe a random variable representing annual percent return for Vanguard Total Stock Index (all stocks). Letybe 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	0	31	15	22	18	31	11	20	18
y:	28	8	28	23	22	25	11	8	3	2

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