This document contains various math problems and solutions including: 1) Calculating the harmonic mean of several numbers. The harmonic mean is found to be 0.3147. 2) Finding the geometric mean of the values 15, 12, 13, 19, 10. The geometric mean is calculated to be 1.1761. 3) An example of calculating the median for grouped data involving test scores and number of students. The median is found to be 10-14.