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Statistics & Probability Flashcards: Developing Empirical Probability Distributions Expected Value

Study Developing Empirical Probability Distributions Expected Value in Statistics & Probability with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What is the expected value formula for a discrete random variable XX?

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ANSWER

E(X)=∑x P(x)E(X)=\sum x\,P(x). Multiply each value by its probability and sum all products.

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Statistics & Probability: Expected Value

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This deck focuses on Developing Empirical Probability Distributions Expected Value, giving you a quick way to review the definitions, rules, and examples that matter most for Statistics & Probability.

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Practice questions

1 of 23Practice questions for this set
A spinner game is played 120 times. The observed counts are: land on 1 (18 times), land on 2 (27 times), land on 3 (33 times), land on 4 (42 times). Define the random variable XX as the number landed on. Using relative frequencies from these data as estimated probabilities, what is the expected value of XX based on the empirical distribution?
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