15.设总体 approx N(0,1), (X1,X2,X3,X4,X5,X6)为样本,另设-|||-=(({X)_(1)+(X)_(2))}^2+(({X)_(3)+(X)_(4))}^2+(({X)_(5)+(X)_(6))}^2, 试问当k取何值时kY服从x^2分布.

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