Jane is 2 1/4 years younger then her sister, hilda. If hilda is 15 5/6 years old, how is Jane? Express your answer in lowest terms.

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