已知随机变量只能取三个值x1,x2,x3,其概率依次成等差数列,求公差d的取值范围能否这样算,p1+P1+d+P1+2d=13P1+3d=1 P1=1-3d\20当d>0,0
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/25 20:46:09
![已知随机变量只能取三个值x1,x2,x3,其概率依次成等差数列,求公差d的取值范围能否这样算,p1+P1+d+P1+2d=13P1+3d=1 P1=1-3d\20当d>0,0](/uploads/image/z/7059421-37-1.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8F%E5%8F%AA%E8%83%BD%E5%8F%96%E4%B8%89%E4%B8%AA%E5%80%BCx1%2Cx2%2Cx3%2C%E5%85%B6%E6%A6%82%E7%8E%87%E4%BE%9D%E6%AC%A1%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E6%B1%82%E5%85%AC%E5%B7%AEd%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E8%83%BD%E5%90%A6%E8%BF%99%E6%A0%B7%E7%AE%97%2Cp1%2BP1%2Bd%2BP1%2B2d%3D13P1%2B3d%3D1+P1%3D1-3d%5C20%E5%BD%93d%3E0%2C0)
已知随机变量只能取三个值x1,x2,x3,其概率依次成等差数列,求公差d的取值范围能否这样算,p1+P1+d+P1+2d=13P1+3d=1 P1=1-3d\20当d>0,0
已知随机变量只能取三个值x1,x2,x3,其概率依次成等差数列,求公差d的取值范围
能否这样算,p1+P1+d+P1+2d=1
3P1+3d=1 P1=1-3d\2
0
当d>0,0
已知随机变量只能取三个值x1,x2,x3,其概率依次成等差数列,求公差d的取值范围能否这样算,p1+P1+d+P1+2d=13P1+3d=1 P1=1-3d\20当d>0,0
3P1 + 3d = 1
d = 1/3 - P1
P1 > 0
so d < 1/3
P1 < 1
so d > -2/3