发布网友 发布时间:2024-10-06 09:09
共1个回答
热心网友 时间:9分钟前
由二项分布的性质:EX=np,DX=np(1-p)
则<span dealflag="1" class="MathZyb" mathtag="math" style="whiteSpace:nowrap;wordSpacing:normal;wordWrap:normal"><table cellpadding="-1" cellspacing="-1" style="margin-right:1px"><tr><td style="border-bottom:1px solid black;padding-bottom:1px;font-size:90%"><span><span>(DX)</span><span style="vertical-align:super;font-size:90%" dealflag="1">2</span></span></td></tr><tr><td style="padding-top:1px;font-size:90%"><span><span>(EX)</span><span style="vertical-align:super;font-size:90%" dealflag="1">2</span></span></td></tr></table></span>=(1-p)<sup>2</sup>.
故答案:(1-p)<sup>2</sup>