A boat goes 24km upstream and 28km downstream in 6 hrs. It
Roes 30km upstream and 21km downstream in 6 hrs. Find the
speed of the boat in still water and also speed of stream.

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score