The final marks for the Wednesday class in Statistics 101 are ready to be posted. The class average is 60%, with a standard deviation of 10. The distribution of grades is approximately bell-shaped. (Round the final answer to 2 deciamal places.)
a. What percentage of the grades are above 90?
Percentage of grades ............%
b. What percentage of the grades are below 50?
Percentage of grades ............%
c. What percentage of the grades are between 50 and 70?
Percentage of grades ............%
d. What percentage of the grades are between 50 and 80?
Percentage of grades ............%
e. What percentage of the grades are between 50 and 90?
Percentage of grades ............%
f. What percentage of the grades are less than 50 or more than 80?
Percentage of grades ............%

Answer rating: 100% (QA)

a 60 10 right tailed X 90 Z X 300 PX 90 PZ 300 P Z 300 00013 answer 013 b 60 ... View the full answer