In this year, a random sample of size 45 returns is selected for review. Describe the approximated distribution of the sample mean (shape, center, and spread).

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

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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?