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12. A random sample of 25 college students has an average test score of 81.5 with a standard deviation of 10.2 . The population of

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12. A random sample of 25 college students has an average test score of 81.5 with a standard deviation of 10.2 . The population of test scores is known to be normally distributed. What is the 95% condence interval for the mean test score of college students? 3 a. (66.3, 96.7) [3 b. (77.3, 85.7) E c. (74.1, 88.9) E d. (64.7, 98.3) W

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