21. In the accompanying diagram, the shaded area represents approximately 95% of the scores on a standardized test. If these scores ranged from 78 to 92,
a) What is the mean?
b) What is the standard deviation?

This stem-and-leaf plot represents the heights of the students on ralph’s basketball team. one student’s height is missing from the plot. if the mean height of all the students on the team is 61 inches, what is the missing height? a. 55 in. b. 59 in. c. 61 in. d. 65 in.