The line graph shows the number of bird park tickets sold from Wednesday to Sunday.

1. What is the difference between the highest and the lowest number of bird park tickets sold from Wednesday to Sunday?
2. Between which 2 days did the number of tickets sold increase the greatest? Give your answer in the following format.  (Eg Mon to Tue)

(a)
Highest number of bird park tickets sold = 4000 (Saturday)
Lowest number of bird park tickets sold = 1100 (Thursday)

Difference between the highest and the lowest number of bird park tickets sold from from Wednesday to Sunday
= 4000 - 1100
= 2900

(b)
To find the greatest increase in the number of tickets sold, look for the steepest increasing slope.

Between Thursday to Friday, the number of tickets sold increased the greatest.

To show: 

Decrease in the number of bird park tickets sold from Wednesday to Thursday
= 3900 - 1100
= 2900

Increase in the number of bird park tickets sold from Thursday to Friday
= 2600 - 1100
= 1500

Increase in the number of bird park tickets sold from Friday to Saturday
= 4000 - 2600
= 1400

Decrease in the number of bird park tickets sold from Saturday to Sunday
= 4000 - 2700
= 1300

Answer(s): (a) 2900; (b) Thu to Fri