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A random variate X takes the values 0, 1, 2, 3 and its mean is 1.3. If `P(X= 3) = 2P(X= 1)` and `P(X= 2) = 0.3`, then `P(X= 0)` is equal to

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` {E}[{X}]=sum_{{i}=0}^{3} {x}_{{i}} {p}_{{i}}=0 * {P}({X}=0)+1 * {P}({X}=1)+2 * {P}({X}=2)+3 * {P}({X}=3)= `

`1.3`

...
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