Bozena is an ecologist who studies the change in the tiger population of Siberia over time the relationship between the elapsed time t in years since bonzena started studying the population and the number of tigers, N(t) is modeled by the following function

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