SACE Stage 2 Mathematical Methods Practice Questions - SACE Stage 2 Mathematical Methods External Assessment Exam

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A discrete random variable X has probability distribution P(X=1)=0.1, P(X=2)=0.3, P(X=3)=0.4, and P(X=4)=0.2. What is the expected value E(X)?

2.5 2.7 3.0 2.8

Correct Answer:

2.7

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