The dataset below represents the population density per square mile of land area in 25 states in the 2010 U. S. Census. What is the 17th percentile? 1,19,35,43,49,55,56,56,63,67,94,105 ,110,168,175,181,212,231,239,351,46 1,595,738,839,9857

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?