Use the Empirical Rule to answer the following questions about test scores.
a. The mean is ______.
b. The standard deviation is ______.
c. ______% of the test scores are between 58 and 66.
d. ______% of the test scores are between 54 and 70.
e. ______% of the test scores are between 50 and 74.
f. ______% of the test scores are between 62 and 66.
g. ______% of the test scores are less than 62.
h. ______% of the test scores are less than 66.