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The probability distribution of a discre...

The probability distribution of a discrete random variable `X` is given as under: `X :1242A3A5A` `P(X):1/21/53/(25)1/(10)1/(25)1/(25)` Calculate: The value of `A ,ifE(X)=2. 94` (ii) Variance of`Xdot`

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(i) `E(X)=2.94`
`E(X)=sum P_i X_i`
`2.94=1/2+2/5+12/25+2A/10+3A/25+5A/25`
`(25+20+24+10A+6A+10A)/50`
...
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