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【多选题】
若甲的期望值高于乙的期望值，且甲的标准离差小于乙的标准离差，下列表述不正确的有（ ）。A.
甲的风险小，应选择甲方案
B.
乙的风险小，应选择乙方案
C.
甲的风险与乙的风险相同
D.
难以确定，因期望值不同，需进一步计算标准离差率
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