设随机变量具有对称的密度函数，即，为的分布函数，则对任意实数,.https://img-ph-mirror.nosdn.127.net/lEiAQJQKvY14Qo2qj0E1Aw==/1072982611321422975.pnghttps://img-ph-mirror.nosdn.127.net/9BNVrADIkYbX410xL65RVg==/6631230493421812375.pnghttps://img-ph-mirror.nosdn.127.net/055psK1qEelFN3vSsaG0zQ==/6599288581122298726.pnghttps://img-ph-mirror.nosdn.127.net/lEiAQJQKvY14Qo2qj0E1Aw==/1072982611321422975.pnghttps://img-ph-mirror.nosdn.127.net/5ISpkzigMMeRmCo4M1UdLQ==/6608183630190574284.pnghttps://img-ph-mirror.nosdn.127.net/DDNn9dWDdvU11YRbl_vFSg==/285697101462025554.png
举一反三
- 设随机变量服从正态分布,且已知标准正态分布函数表如下: 则下列结论不正确的是https://img-ph-mirror.nosdn.127.net/lEiAQJQKvY14Qo2qj0E1Aw==/1072982611321422975.pnghttps://img-ph-mirror.nosdn.127.net/_5EKC-OYqXO2iGhMRx69Og==/6619385454654777394.pnghttps://img-ph-mirror.nosdn.127.net/mDKpuJY3aKMoNZ1yikpAlA==/6631274473887558980.pnghttps://img-ph-mirror.nosdn.127.net/NWKfu-UjOFTfIbrLH342kw==/6631309658261856133.png
- 设随机变量 在区间 上服从均匀分布，对进行三次独立的观测中，则刚好有两次的观测值大于3的概率。https://img-ph-mirror.nosdn.127.net/lEiAQJQKvY14Qo2qj0E1Aw==/1072982611321422975.pnghttps://img-ph-mirror.nosdn.127.net/-iZILG22F9hEJk4ASe-Jog==/66316010
- 随机变量X的分布函数为 则P{X=0}：P{0<X≤1/2} = ____________http://img-ph-mirror.nosdn.127.net/S0u2MrNHVpY11hPfNc2-OA==/6631866011143675664.png
- 设随机变量 )，记 ，则的密度函数 为。https://img-ph-mirror.nosdn.127.net/ePcHOcmdoHIDoMt9jLIn2g==/6631702183909111121.pnghttps://img-ph-mirror.nosdn.127.net/_HG7V_e5OPtONcYCrJRirQ==/6631573541048662542.pnghttps://img-
- 图所示机构的自由度是（ ）。[img=225x225]18034e49029b42b.jpg[/img] A: n=7, PL=10, Ph=0, F=1 B: n=9, PL=12, Ph=2, F=1 C: n=8, PL=11, Ph=1, F=1 D: n=8, PL=11, Ph=0, F=2