The random variable X takes the values 1, 2, 3, 4. It is given that 𝑃(X =

x) = kx(x + a), where k and a are constants.

Given that 𝑃(X = 4) = 3𝑃(X = 2),

i) Find the value of a and the value of k.

ii) Given that 𝐸[𝑋] = 3.2, find Var X.

asked by guest
on Mar 30, 2025 at 4:13 am



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