New PMP Question & Answers with explanation

The Big Mouth grocery food chain is planning to modernize their IT department by developing a new bar coding system that will allow them to keep their shelves stocked more efficiently by using the Just in Time strategy. However, during the project chartering phase the project manager explained to them that in order to execute the Just in Time strategy, a company must have a high level of:
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Who is responsible for managing changes within a project?
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Your project selection committee is evaluating three projects. They are using a weighted scoring model that has three criteria: decrease training time, streamline customer support functions, and return on investment. The weights for these criteria are 5, 4, and 2, respectively. Your selection committee has finished scoring the three projects and has given you the scores for the three criteria. They are as follows: Project 1: decrease training = 5, streamline support = 3, return on investment = 5 Project 2: decrease training = 3, streamline support = 5, return on investment = 5 Project 3: decrease training = 4, streamline support = 4, return on investment = 3 Which project should you choose based on the scores from the weighted scoring model?
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All of the following represent values addressed in the Code of Ethics and Professional Conduct, except for which one?
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Your project estimates have come in as follows: Most Likely is 100 days, Pessimistic is 250 days, Optimistic is 75 days. What is the expected value of this estimate?
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