Ben has information about the height in cm and the weight in kg of each of ten rugby players and is asked to draw a scatter graph and line of best fit for this information. Here is his answer

What is (28 + 7 + 6 + 3) x 1/2 show your work

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed