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Predict with transformed data

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A biologist observed a curved relationship between the average heart rates and life expectancies of several mammal species in a large sample. The biologist took the natural logarithm for the values of both variables, and they noticed a linear relationship in the transformed data.
Here's the least-squares regression equation for the transformed data, where life expectancy (LE) is in years and heart rate (HR) is in beats per minute.
According to this model, what is the predicted life expectancy of a mammal species whose average heart rate is 100 beats per minute?
You may round your answer to the nearest whole year.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi