Brett golfs for the forestville knights high school team. when he practices his putting, he can make a 10-foot putt 80% of the time. if brett takes 200 putts for practice, what is the standard deviation of the number of putts he will make?

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