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        "intro": "<p>Probability is about the study of uncertainty. Scientists and engineers are expected to design and produce systems\nwhich are both useful and reliable. Essentially we are dealing with situations where \u2018chance\u2019 is at\nwork and probability theory gives us the theoretical underpinning necessary for a full understanding\nof any experimental results we observe in practice.&nbsp;<\/p><p>Probability theory also gives us the tools to set up\nmathematical models of systems and processes which are affected by random occurrences or \u2018chance\u2019.\nIn fact the study of probability enables scientists and engineers to discuss the reliability of the processes they use\nand the systems they produce in terms that other scientists, engineers and designers can understand.\nIt is worth noting that \u2018chance\u2019 is taken to be responsible for variations in simple manufactured\nproducts such as screws, bolts, and light bulbs as well as complex products such as cars, ships and\naircraft. In each of these products, small chance variations in raw materials and production processes\nmay have a substantial effect on a product.<br><\/p>",
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