This diagram is not correct

the word polygon on the diagram should be changed with what?

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

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1