Find all the missing elements:

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

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

What is the y-intercept of the line given by the equation