Social networking websites are often assumed to help shy people communicate and make friends. However, a study of site users has shown that they have lower self-esteem than those who do not use social networking sites.

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