What is the best estimate for 3 1/3 x 5/6?

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

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.

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?