设随机变量X的分布律为P{X=k}=a/N,k=1,2,...,N,求常数a.最好有解题步骤及说明
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![设随机变量X的分布律为P{X=k}=a/N,k=1,2,...,N,求常数a.最好有解题步骤及说明](/uploads/image/z/6603211-19-1.jpg?t=%E8%AE%BE%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8FX%E7%9A%84%E5%88%86%E5%B8%83%E5%BE%8B%E4%B8%BAP%7BX%3Dk%7D%3Da%2FN%2Ck%3D1%2C2%2C...%2CN%2C%E6%B1%82%E5%B8%B8%E6%95%B0a.%E6%9C%80%E5%A5%BD%E6%9C%89%E8%A7%A3%E9%A2%98%E6%AD%A5%E9%AA%A4%E5%8F%8A%E8%AF%B4%E6%98%8E)
设随机变量X的分布律为P{X=k}=a/N,k=1,2,...,N,求常数a.最好有解题步骤及说明
设随机变量X的分布律为P{X=k}=a/N,k=1,2,...,N,求常数a.最好有解题步骤及说明
设随机变量X的分布律为P{X=k}=a/N,k=1,2,...,N,求常数a.最好有解题步骤及说明
∑P{X=k}=1(分布律之和为1)
P{X=1}+P{X=2}+...+P{X=N}=1
a/N+a/N+...+a/N=1
a=1