CAN SOMEONE PLEASE HELP ME WITH 19 AND 20 PLEASE ASAP THIS IS VERY URGENT

Really need on these. i have no idea what to do

How is the number of vertices for a prism related to the name of the prism

The median of a data set is the measure of center that is found by adding the data values and dividing the total by the number of data values that is the value that occurs with the greatest frequency that is the value midway between the maximum and minimum values in the original data set that is the middle value when the original data values are arranged in order of increasing (or decreasing) magnitude