Private colleges tend to cost more than public colleges. Here are some summary statistics for the amount of college debt that undergraduate students graduate with from 4-year institutions in one region. Institution type Mean debt (thousands of dollars) Standard deviation (thousands of dollars) Private Il = $24. 0 = $16 Public u = $18 0 = $15 Niklas graduated from a private institution and Cem graduated from a public institution. Each had $35 thousand dollars of college debt. Relative to their institution type, who graduated with more debt?​