22. Suppose many students take a 10-question quiz, and the mean turns out to be 7.22...

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22. Suppose many students take a 10-question quiz, and the mean turns out to be 7.22 answers correct. Suppose the standard deviation turns out to be 0.722. What is the coefficient of variation? (a) We can't answer this unless we know how many people take the quiz. (b) 0.1 (c) 10 (d) 100 23. Suppose several students take a 10-question quiz. The worst score is 3 correct, and the best scare is 10 correct. What is the range? (a) We can't answer this unless we know how many people take the quiz. (b) 3/7 (c) 7 (d) 7/3 24. Suppose several students take a 10-question quiz. The worst score is 3 correct, and the best score is 10 correct. What is the 50th percentile? (a) 7, which is equal to 10 - 3. (b) 6.5, which is equal to (e) 301/2, which is equal to the square root of (3 x 10). (d) We can't answer this unless we know how many students receive each scare. 25. Imagine that you take a standardized test, and after you've finished you are told that you are at the 91st decile. This means (a) 90 of the students taking the same test have scores higher than yours (b) 90% of all the students taking the same test have scores higher than yours (c) 90 of the students taking the same test have scores lower than yours (d) nothing; there is no such thing as the 91st decile 22. Suppose many students take a 10-question quiz, and the mean turns out to be 7.22 answers correct. Suppose the standard deviation turns out to be 0.722. What is the coefficient of variation? (a) We can't answer this unless we know how many people take the quiz. (b) 0.1 (c) 10 (d) 100 23. Suppose several students take a 10-question quiz. The worst score is 3 correct, and the best scare is 10 correct. What is the range? (a) We can't answer this unless we know how many people take the quiz. (b) 3/7 (c) 7 (d) 7/3 24. Suppose several students take a 10-question quiz. The worst score is 3 correct, and the best score is 10 correct. What is the 50th percentile? (a) 7, which is equal to 10 - 3. (b) 6.5, which is equal to (e) 301/2, which is equal to the square root of (3 x 10). (d) We can't answer this unless we know how many students receive each scare. 25. Imagine that you take a standardized test, and after you've finished you are told that you are at the 91st decile. This means (a) 90 of the students taking the same test have scores higher than yours (b) 90% of all the students taking the same test have scores higher than yours (c) 90 of the students taking the same test have scores lower than yours (d) nothing; there is no such thing as the 91st decile