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Statistics, Conditional Probability and Random Variables — Lesson quiz

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1.
Two fair coins are tossed and X is the number of heads. The expected value E(X) is:
0.5
1.5
2
1
2.
For the same random variable X (the number of heads in two coin tosses), the variance Var(X) is:
0.5
0.25
1
1.5
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