Plz help me! I suck at math!

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

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.