Bicycle Crashes Are a Common Cause of Severe Injuries in Childhood.A

Bicycle crashes are a common cause of severe injuries in childhood.A researcher theorized that this might be because of inadequate "gap" time (the time between a bicycling child clearing an intersection and the subsequent entry of an oncoming car into that intersection).A researcher experimentally investigated the gap judgments of 10-year-olds by placing them in a computer-generated virtual environment of cars approaching an intersection at 25 mph.The following gap times were observed for ten randomly selected children: a)Use the given data to produce a point estimate ofm, the population mean gap time of 10-year-olds from this population. b)Use the given data to produce an unbiased point estimate of , the population variance of the gap time of 10-year-olds from this population.