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A probability model: Value 1 2 3 4 Probability 0.2 ? 0.3 0.1 What is the...

A probability model:

Value 1 2 3 4
Probability 0.2 ? 0.3 0.1
What is the probability that x=2?

Find E(X).

find σ2X.

find σx

Find E(2 – 5X)

Find V(2 – 5X).
Math   Statistics-And-Probability   
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