PLEASE HELP IMAGE ATTACHED ILL MARK THE RIGHT ANSWER BRAINLIEST

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

Proportions in triangles solve for x

What 8/12+8/11 in another way than and improper fraction