Will give ! the weights of baby polar bears in a zoo are normally distributed with a mean weight of 2.2 pounds and a standard deviation of 0.3 pounds. about what percent of the baby polar bears weigh between 2.2 pounds and 2.5 pounds?

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?