What if the value of X^2 + 3x + 2 if X = 15

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

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

Tell whether the two rates form a proportion