若ζ是离散型随机变量,则E( ζ -Eζ)=A Eζ B 0 C 2Eζ D(Eζ)^2能说具体点吗

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若ζ是离散型随机变量,则E( ζ -Eζ)=A Eζ B 0 C 2Eζ D(Eζ)^2能说具体点吗
若ζ是离散型随机变量,则E( ζ -Eζ)=
A Eζ B 0 C 2Eζ D(Eζ)^2
能说具体点吗

若ζ是离散型随机变量,则E( ζ -Eζ)=A Eζ B 0 C 2Eζ D(Eζ)^2能说具体点吗
E(ζ-Eζ)=Eζ-E(Eζ）,由于Eζ是常数,∴E(Eζ）=Eζ,
∴E(ζ-Eζ)=Eζ-E(Eζ)=Eζ-Eζ=0
答案选B

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To get a sneak peek at the Nike SB “Don’t Fear the Sweeper” Tour, check out the Nike SB video and screencaps and see your favorite Team Nike skaters do their thing in Denver, Kansas City, and Minneapolis. The three aforementioned cities covers the first part of the tour, so be sure to check back for newer videologs as the Sweeper tour progresses. In the video you’ll see the notable newcomer Eric Koston and fellow new rider Cory Kennedy wearing the Nike SB Stefan Janoski.
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