# Quiz7.2B - 5 Find the lowest grade X o such that P X ≥ X...

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Quiz 7.2B AP Statistics Name: A distribution of grades in an introductory statistics class (where A = 4, B = 3, etc.) is: X 0 1 2 3 4 p(X) .10 .15 .30 .30 .15 1. A graduate student needs at least a B to get credit for the course. What are her chances of getting at least a B? 2. Find P(1 ≤ X < 3). 3. Find the average (i.e., mean) grade in this class. 4. Find the standard deviation for the class grades.
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Unformatted text preview: 5. Find the lowest grade X o such that P ( X ≥ X o ) < 0.5. 6. Circle the correct answer: X is an example of a ( discrete ) ( continuous ) random variable. 7. A lottery offers one \$1,000 prize, one \$500 prize, and five \$100 prizes. One thousand tickets are sold at \$3 each. Find the expectation (expected value) if a person buys one ticket. Chapter 7...
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