Khalid and Jesse took different overnight trains. The graph shows the relationship between the total distance Khalid travelled and the time in hours. The distance that Jesse travelled after x hours is given by the equation y = 150x

The median of a data set is the measure of center that is found by adding the data values and dividing the total by the number of data values that is the value that occurs with the greatest frequency that is the value midway between the maximum and minimum values in the original data set that is the middle value when the original data values are arranged in order of increasing (or decreasing) magnitude