New PMP Question & Answers with explanation

You are a project manager for Move It Now trucking company. Your company specializes in moving household goods across the city or across the country. Your project involves upgrading the nationwide computer network for the company. Your lead engineer has given you the following estimates for a critical path activity: 60 days most likely, 72 days pessimistic, 48 days optimistic. What is the standard deviation?
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You are a project manager for Move It Now trucking company. Your company specializes in moving household goods across the city or across the country. Your project involves upgrading the nationwide computer network for the company. Your lead engineer has given you the following estimates for a critical path activity: 60 days most likely, 72 days pessimistic, 48 days optimistic. What is the weighted average or expected value?
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Which of the following statements is true regarding the critical path?
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Use the following graphic to answer this question. If the duration of activity B was changed to 10 days and the duration of activity G was changed to 9 days, which path is the critical path?
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You are a project manager for Picture Shades, Inc. Your company manufactures window shades that have replicas of Renaissance-era paintings for hotel chains. Picture Shades is taking its product to the home market, and you're managing the new project. It will offer its products at retail stores as well as on its website. You're developing the project schedule for this undertaking. Looking at the following graph, which path is the critical path?
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