The brain volumes (cm cubedcm3) of 50 brains vary from a low of 904 cm cubedcm3 to a high of 1502 cm cubedcm3. Use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 171.5 cm cubedcm3, assuming the estimate is accurate if it is within 15 cm cubedcm3.
