The NYC bus costs $2.50 per ride. They also sell a bus pass that is $15 and then only $1.00 per ride. How many rides would it take for the costs to be the same?

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