Tabitha's Time Spent on Homework

Which best explains who spends more time on homework?

Ayana, because she has a higher maximum time spent

Ayana, because she has more variability in her time spent

Tabitha, because she has a higher median time spent

Tabitha, because she has more variability in her time spent

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?