What if it is 10 millimeters

Acompany is testing in comparing to lightbulb designs the box plot shows the number of hours that each lightbulb design last before burning out which statement is best supported by the information of the plot

Need on this geometry question. explain how you did it.

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)