[填空题]
A fast food store owner rec+byl q,tl xr- o+ s+azwk ,,1m3c7rxlcorded the daily number of burgers and hot r,a zk3tyqq4:s pu5 zk+pmm9ft6 zu96dogs sold in her restaurant. The folf6 t zzsrupk,9qk43 qmyta65 mu9z:p+lowing table shows this data for the last eight days. This data is also shown on the scatter diagram below.
The number of burgers sold varies linearly with the number of hot dogs sold.
1. Find
1. the mean number of burgers, $\bar{x}$ ;
2. the mean number of hot dogs, $\bar{y}$ .
2. Find the line of regression equation, y on x , and plot on the scatter diagram above.
3. Use the line of regression equation, y on x , to estimate the number of hot dogs sold on a day when 22 burgers are sold.≈
