The mean temperature for the first 7 days in January was 6 °C. The temperature on the 8th day was -3 °C.
What is the mean temperature for the first 8 days in January?

Answers; a) 135 degree’s b) 30 degree’s c) 180 or 0 degree’s d) 90 degree’s

Answer for 10 points show work you guys in advanced < 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