The pie chart below shows the costs for desalination. Why might middle eastern countries turn to desalination plants only as a last resort? plants have a lot of fixed costs during construction. Plants take a lot of electricity to operate. Plants need a lot of supplies and labor. Plants break down a lot and are hard to maintain.

answer:

When we have different classes of data, there is always an upper and a lower class limit for it i.e. the dataset has a smallest and largest value. Class boundary is the midpoint of the upper class limit of one class and the lower class limit of the subsequent class.

Explanation:

the number of people in the crew was 220, which is calculated from the percentage formula.