Difference between the smallest term in the data set and the largest term in the data set

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

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