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【多选题】
设【图片】独立同服从【图片】分布，Y表示{【图片】}(其中【图片】)的个数，【图片】,则以下选项正确的是A.
Y 服从 B (300 ， 0.25)
B.
P ( Z <310) ≈Ф (1)
C.
Y 近似 服从 N (75, 7.5)
D.
Z 服从均匀分布 U (0, 600)
E.
Z 近似服从正态分布 N (300, 1/3)
F.
P ( Y >90) ≈ 0.5
G.
P ( Z <280) ≈Ф (2)
H.
P ( Z <290) ≈ 1- Ф (1)
I.
P ( Y <60) ≈Ф (2)
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