30 elementary school students are surveyed and asked to name their favorite colors. in reporting the results, which is the best measure of central tendency to use?
a) mean
eliminate
b) median
c) mode
d) range

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.