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This video attempts to explain a few issues that exist in parts (a) and (b) of Q17. In particular, the examiners use of the normal (continuous) distribution to calculate a probability for a binomial (discrete) distribution without using a continuity correction was always bound to end in tears, as the continuity correction is not specified in the course documentation. So why set a question where its use is required to obtain the correct probability? The error made is also illustrated using a simulation of the situation using an Excel spreadsheet.

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