On a recent biology quiz, the class mean was 18 with a standard deviation of 2.6. Calculate the z-score (to 4 decimal places) for a person who received score of 21. z-score for Biology Quiz: The same...

On a recent biology quiz, the class mean was 18 with a standard deviation of 2.6. Calculate the z-score (to 4 decimal places) for a person who received score of 21.

z-score for Biology Quiz:

The same person also took a midterm in their marketing course and received a score of 81. The class mean was 78 with a standard deviation of 6. Calculate the z-score (to 4 decimal places).

z-score for Marketing Midterm:

Which test did the person perform better on compared to the rest of the class?

Find the coefficient of variation for the Biology Quiz. Give answer as a percent to 3 decimal places.
C-Var for Biology Quiz: %
Find the coefficient of variation for the Marketing Midterm. Give answer as a percent to 3 decimal places.
C-Var for Marketing Midterm: %
Which test scores were more variable?