Data set contains three points, and the two residuals are -7 and 4. What is the third residual

The anwser cause i do not understand just plez

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

Julie was able to walk 16 km through the zoo in 6 hours. how long will it take her to walk 24 km through the zoo?