1.
There is some extra food waste that is not shown as it has been sealed away.
I would estimate:
~ 50% food
~ 10% paper
~ 20% plastics
~ 20% metals
2. I could improve the data collection process by using a scale to measure the weight of all the categories. Furthermore, I could improve the process by breaking categories down into more specific sub-categories. For example, plastics could be broken down into several types.
3. I think one of the most concerning waste products that I might use too much are metals and plastics. These usually come in the form of packaging. A way to reduce this waste would be to buy food from brands that use less unnecessary packaging. Also, looking for businesses that use bring your own box/bottle type of services could help reduce packaging waste.