There are 15 girls and 12 boys in Ms. Grady's 6th period class. Ms. Grady will randomly choose one student to solve a problem on the board. What
is the probability Ms. Grady will choose a girl to work out the problem on
the board? *
4/5
5/9
4/9
2/3

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