1.1. The table below shows the distance from the city centre, $x$ km, and the corresponding internet download speed, $y$ Mbps (megabits per second).

Using your calculator, find the regression line of $y$ on $x$ in the form $y=a+bx$.

Round $a$ to the nearest whole number and round $b$ to 2 decimal places.

1.2. Use the regression line in part (a) to predict the download speed in a village that is 250 km away from the city centre.

1.3. A data point $(x,y)$ is removed from the table.

A student calculates the regression line for the remaining data and claims that it has the equation $y=140+0.27x$.

Without further calculation, explain why their answer cannot be correct.