9709 P6 - Nov 2007 - Q2
2973
The random variable X takes the values -2, 0 and 4 only. It is given that \(P(X = -2) = 2p\), \(P(X = 0) = p\) and \(P(X = 4) = 3p\).
- Find \(p\).
- Find \(\overline{E}(X)\) and \(\text{Var}(X)\).
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