A light, flashing regularly, consists of cycles, each cycle having a dark phase and a light phase. The frequency of this light is measured in cycles per second. As the frequency is increased, the eye initially perceives a series of flashes of light, then a coarse flicker, a fine flicker, and ultimately a steady light. The frequency at which the flickering disappears is called the fusion frequency. The table below shows the results of an experiment in which the fusion frequency $F$ was measured as a function of the light intensity $I$. It is modeled by $F=a \ \ln{I} +b$.

Find $\ln{I}$ for each value of $I$ in the table above, and then use linear regression on a calculator to estimate $a$ and $b$ in the linear fit $F= a \ \ln{I} +b$. In the blanks below, enter the corresponding values for $a$ and $b$:
$a =$
$b =$
(round values to 2 decimal places)