Aresearcher studying public opinion of proposed social security changes obtains a simple random sample of 35 adult americans and ask them whether or not they support he proposed changes. to say the distribution of the sample proportion of adults who respond yes is approximately normal, how many more adult americans does the researcher need to sample in the following cases ?

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?