Drink-carton capacity decisions

Drink-carton capacities 200,250,300,350,400 mL have frequencies 10,18,8,\(x\),6.

1. If the unique mode is 250 mL, write the complete inequality for the integer frequency \(x\).
2. If the median capacity is 300 mL, find the largest possible \(x\).
3. If \(x=7\), calculate the mean capacity.
4. Which average should a canteen manager use when deciding which capacity to order in the largest quantity? Explain.