The brain volumes (cm) of 50 brains vary from a low of 904 cm to a high of 1486 cm. a. Use the range rule of thumb to estimate the standard deviation. The estimated standard deviation is cm (Type an integer or a decimal) Work/Technique Submission: 3 pts will be assessed in your submission b. Compare the result from part "a" to the exact standard deviation of 174.4 cm assuming the estimate is accurate if it is within 15 cm. (Type your answer as an uppercase letter that corresponds to your choice) A The approximation is accurate because the error of the range rule of thumb's approximation is greater than 15 cm. B The approximation is accurate because the error of the range rule of thumb's approximation is less than 15 cm. C The approximation is not accurate because the error of the range rule of thumb's approximation is greater than 15 cm. D The approximation is not accurate because the error of the range rule of thumb's approximation is less than 15 cm.