SOLUTION: Paul earned 75 on his Stats midterm, 83 on his Marketing midterm and 78 in his Calculus midterm. In the Stats class the mean score was 65 with standard deviation 4. In the Calculus

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Question 385210: Paul earned 75 on his Stats midterm, 83 on his Marketing midterm and 78 in his Calculus midterm. In the Stats class the mean score was 65 with standard deviation 4. In the Calculus class the mean score was 85 with standard deviation 6.
a. Convert each midterm score to a standard z score.
b. On which test did he do better.
Answer by stanbon(75887) About Me  (Show Source):
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Paul earned 75 on his Stats midterm, 83 on his Marketing midterm and 78 in his Calculus midterm. In the Stats class the mean score was 65 with standard deviation 4. In the Calculus class the mean score was 85 with standard deviation 6.
a. Convert each midterm score to a standard z score.
b. On which test did he do better.
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To find the z-score for "x" use the following formula:
z(x) = (x-u)/sigma
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Cheers,
Stan H.