The brain volumes ​(cm^3​) of 50 brains vary from a low of 914 cm^3 to a high of 1492 cm^3. Use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 186.4 cm^3​, assuming the estimate is accurate if it is within 15 cm^3.

Therefore

X is not Accurate as it Falls outside of the Volume 15cm^3

Step-by-step explanation:

From the question we are told that:

Sample size

Volume Range

Exact standard deviation

Generally the equation for range rule of thumb is mathematically given by

Where

Therefore

Estimate Standard deviation

Since

Exact standard deviation is 186.4 cm^3​

Comparing

Therefore

X is not Accurate as is Falls outside of the Hallmark 15cm^3