Mrs. Sparks is a 9th-grade Algebra 1 teacher. She teaches three Algebra 1 courses and all the classes recently took a chapter exam.
Below are the scores.

Class 1: 45, 68, 77, 90, 90, 95, 100, 100, 86, 90, 50, 55
Class 2: 64, 65, 70, 40, 100, 87, 84, 88, 90, 90, 95, 80
Class 3: 70, 75, 75, 90, 100, 80, 55, 65, 76, 80, 88, 99

a. Find the mean, median, mode, and range of Class 1.
b. Find the mean, median, mode, and range of Class 2.
c. Find the mean, median, mode, and range of Class 3
f. Find the standard deviation of Class 1.
e. Find the standard deviation of Class 2.
f. Find the standard deviation of Class 3.
g. Which class had a higher standard deviation and what does that mean?