What is the coefficient in the expression 5 plus 9y

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

I’m really confused and need to learn this

Given that s is the centroid of triangle mno, find sq.