Decision theory, the modeling and study of man's decision-making, is arguably most important because in learning how we make decisions, we can learn to make better ones. A link is provided to the Wikipedia article on decision theory, which, by the way, is subject of discreet mathematics. The curious person would surf on over and at least skim the article.
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Decision making theory is used to determine the values and other issues, including uncertainties, that relate to the decision being made. It is then determined if the decision is a rational and wise decision to be made.
what are the importance of quantitative techniques in managerial dicision making
It develops the power to apply logic and logic in an integral part of mathematics.
statistics and accounting both are very similar to each other regarding their uses, because both are tools of decision making. To take decision regarding average, standard and marginal you have to take help from statistics even if you are accountant.
The crucial importance of prime numbers to number theory and mathematics in general stems from the fundamental theorem of arithmetic.