New PMP Question & Answers with explanation

As part of the procurement process, the procuring organization elected to have an estimate of costs prepared by an outside professional estimator. The estimator came up with an estimate of $500,000. However, the cost estimates prepared by prospective sellers were in the range of $200,000. How can this be best interpreted?
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Which of the following is an output of the Conduct Procurements process?
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If you had an experience with a particularly well or poorly performing vendor, what is the correct way to document this experience for future projects?
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What is the BEST tool/technique that provides expected cost of a procurement by a third party and helps identify significant variations from cost estimates prepared in-house?
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Which of the following techniques can help clarify the structure, requirements, and other terms of the purchases so that mutual agreement between a buyer and a seller can be reached prior to signing the contract?
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