Can someone me on 17 and 18? ? i really need the !

With alll of except for the 2 that i did already

The tile along the edge of a triangular community pool needs to be replaced? ?

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