The brain volumes (cm³) of 50 brains vary from a low of 904 cm³ to a high of 1486 cm³. Use the range rule of thumb to estimate the standard deviations and compare the result to the exact standard deviation of 164.5 cm³, assuming the estimate is accurate if it is within 15 cm³. The estimated standard deviation is cm³. (Type an integer or a decimal. Do not round.)

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