The average hourly wage of production workers in manufacturing is $13.50 and a standard deviation of $2.50. The wages are normally distributed. One thousand workers were
chosen to participate in the survey
What percentage of workers earn between $8.50 and $16.00? Round your answer to the
nearest hundredth of a percent.

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?