1.

If random variable X has the following probability distribution :

Answer»

`(7)/(81)`
`(5)/(81)`
`(2)/(81)`
`(1)/(81)`

Solution :`therefore sum_(r=0)^(8)P(X=r)=1`
`RARR a+3a+5a+7a+9a+11a+13a+15a+17a=1`
`rArr a=(1)/(81)`


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