A-LevelMathematicsProbability and statisticsOct/Nov 2020Paper 6 Q710 Marks
Before a certain type of book is published it is checked for errors, which are then corrected. For costing purposes each error is classified as either minor or major. The numbers of minor and major errors in a book are modelled by the independent distributions N(380, 140) and N(210, 80) respectively. You should assume that no continuity corrections are needed when using these models. A book of this type is chosen at random.
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