A Medical Statistician Wanted to Examine the Relationship Between the Amount

A medical statistician wanted to examine the relationship between the amount of sunshine (x)and incidence of skin cancer (y).As an experiment he found the number of skin cancers detected per 100,000 of population and the average daily sunshine in eight counties around the country.These data are shown below. $$\begin{array} { | l | c : c c c : c c c c c c c c | } \hline \text { Average Daily Sunshine } & 5 & 7 & 6 & 7 & 9 & 6 & 4 & 3 \\\hline \text { Sikin Cancer per } 100,000 & 7 & 11 & 9 & 12 & 15 & 10 & 7 & 5 \\\hline\end{array}$$ Draw a scatter plot and find the least squares regression line.
$\hat{\mathrm{y}}=$ ____________________