Aset of data with 100 observati removed, what is the mean of the new data se of 267 there are six outliers in the data set, which have a mean of 688. if the six outliers are

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?