11. A study found that 72% of people wear seat belts. If three people are selected at random, find the probability that all three wear their seat belts. Would you consider this
likely or unlikely to occur?

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.