设随机变量X服从正态分布N(μ,σ2),则随σ的增大,概率P{|X-μ|<σ[ ]
(A) 单调增大;
(B) 单调减小;
(C) 保持不变;
(D) 增减不定.
第1题
He was so engaged ______ his business that he hadn't been home for a month.
A.at
B.on
C.for
D.in
第2题
He was so engaged ______ his business that he hadn't been home for a month.
A.at
B.on
C.for
D.in
第3题
He was so engaged ______ his business that he hadn't been home for a month.
A.at
B.on
C.for
D.in
第4题
He was so engaged ______ his business that he hadn't been home for a month.
A.at
B.on
C.for
D.in
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