1.1. A second hand car business specialises in dealing with cars valued under £5000. For one day the manager records the sale price of the 35 cars the business sells.

The manager codes the sale prices using the formula $Y=\frac{X-2500}{100}$,  where $£X$ is the sale price of a car.

The coded data for $Y$  is summarised in the box-and-whisker diagram below.

Use the box-and-whisker plot to find: 

    (i)     The median sale price of a car on this day.

    (ii)    The sale price of the least expensive car sold on this day.

1.2. In the last five minutes of business two more cars are sold – one for £3400 and one for £3600.  

(i) Find the $Y$ values for these cars.

(ii)  Describe and justify the effect these two late sales have on the median sale price of a car for this day.