Acard was selected at random from a standard deck of cards. the suit of the card was recorded, and then the card was put back in the deck. the table shows the results after 40 trials. what is the relative frequency of selecting a heart? a: 15% b: 25% c: 27% d: 35% outcome club diamond heart spade number of trials 8 12 14 6

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?