每个投资的期望结果可以用以下的公式计算
期望结果 = (结果值)(该结果的概率)
A的期望结果 = (0.3)(-$20,000) + (0.1)(-$10,000) + (0.3)($30,000) + (0.2)($70,000) + (0.1)($100,000) = $26,000
B的期望结果 = (0.2)(-$20,000) + (0.2)(-$10,000) + (0.2)($30,000) +(0.2)($70,000) + (0.2)($100,000) = $34,000
C的期望结果 = (0.3)(-$20,000) + (0.1)(-$10,000) + (0.2)($30,000) + (0.3)($70,000) + (0.1)($100,000) = $30,000
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