Pls help me with these thx

Write a numeric expression for EACH phrase on the line provided:

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

Which expression gives you the distance between the points (5,1)and(9,-6)

Combine the information in the problem and the chart using the average balance method to solve the problem.