URGENT Rosa has 15 red, 11 orange, 9 yellow, 12 green, 6 blue, and 11 purple pencils in her backpack. About how many times would you expect Rosa to pick a purple pencil if she picked a pencil at random 50 times? Round the the nearest whole number

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?