The line graph shows the number of bird park tickets sold from Tuesday to Saturday.

1. What is the difference between the highest and the lowest number of bird park tickets sold from Tuesday to Saturday?
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 = 4900 (Tuesday)
Lowest number of bird park tickets sold = 1500 (Thursday)

Difference between the highest and the lowest number of bird park tickets sold from from Tuesday to Saturday
= 4900 - 1500
= 3400

(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 Tuesday to Wednesday
= 4900 - 2300
= 2600

Decrease in the number of bird park tickets sold from Wednesday to Thursday
= 2300 - 1500
= 800

Increase in the number of bird park tickets sold from Thursday to Friday
= 2800 - 1500
= 1300

Increase in the number of bird park tickets sold from Friday to Saturday
= 3100 - 2800
= 300

Answer(s): (a) 3400; (b) Thu to Fri