The gasoline gauge on a van initially read 1/8 full. when 15 gallons were added to the tank, the gauge read 3/4 full. how many more gallons are needed to fill the tank?

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