An average salary or arithmetic mean is figured by selecting a group of people with Similar Profiles, adding up their salaries, then dividing this number by the total number of people in the group.
Average salary = Sum of all salaries/total # of Similar Profiles
A median is also known as the 50th percentile. Exactly 50 percent of people make less than the median and 50 percent make more.
Cheers,
Dr. Al Lee