The final marks for the Wednesday class in Statistics 101 are ready to be posted. The class average is 72%, with a standard deviation of 9. Use the Empirical Rule to answer the following questions.
a. What percentage of the grades are above 81?
b. What percentage of the grades are below 54?
c. What percentage of the grades are between 54 and 90?
d. What percentage of the grades are between 54 and 81?
e. What percentage of the grades are between 54 and 99?
f. What percentage of the grades are less than 63 or more than 90?