Bar Graph: Muffin Sales Over a Week

The bar graph shows the number of muffins Mrs Leong sold in a particular week.

1. The number of muffins sold on Wednesday was \(\frac{3}{5}\) of the number of muffins sold on Saturday. Calculate the number of muffins sold on Saturday.
2. Complete the bar graph.
3. On which days of the week was there a drop in the sales of the muffins as compared to the previous day?
4. Find the average number of muffins sold over the \(6\) days.