A clothing store donated a percent of every sale to hospitals. The total sales were ​$8,450 so the store donated ​$507. What percent of ​$8,450 was donated to hospitals​?

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