A master's degree in education varies in tuition cost, depending on the university you attend. The average tuition cost for public (state) schools is around $15,000 (less for residents), while the average cost at a private school is $35,000, and online schools average $18,000. (All figures are as of 2011.).he Average Cost of a Masters Degree in Education. A master's degree in education varies in tuition cost, depending on the university...