Please help me I've been stuck on these type of problems and i don't get it.

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

Write 5 in the form of a/b using integers to show it as a rational number

Will make ! for correct answer the dot plot below shows the number of toys 21 shops sold in an hour.is the median or the mean a better center for this data and why? a. median; because the data is not symmetric and there are outliersb. median; because the data is symmetric and there are no outliersc. mean; because the data is symmetric and there are no outliersd. mean; because the data is skewed and there are outliers