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Quantitative methods are part of the core course for attaining a Master's in Business Administration (MBA) at virtually every reputable business school, and for good reason. Most business decisions involve uncertainty, trade-offs, and ultimately monetary values. These kinds of problems require something more than judgment and qualitative generalities. They require numbers and frameworks for dealing with uncertainty. Otherwise you are just guessing.
There is broad consensus among business academics on what main topics should be covered in an MBA quantitative methods course. Keeping in mind that the MBA aims to produce better managers rather than mathematical technocrats, there are four general areas that managers need to know about.