The time (in minutes) between arrivals of customers to a post office is to be modelled by the exponential distribution with mean 0.44. give your answers to two decimal places. what is the probability that the time between consecutive customers is less than 15 seconds?

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.