A stock has returns of 18 percent, 15 percent, -21 percent, and 6 percent for the past four years. Based on this information, what is the 95 percent probability range of returns for any one given year?

	a.	-31.00 to 40.00 percent
	b.	-47.68 to 54.68 percent
	c.	-71.73 to 71.73 percent
	d.	-24.60 to 31.80 percent
	e.	-13.56 to 20.56 percent