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текстовые задачи задачи на проценты задание 11 егэ математика Question 463368: a test consists of 90 multiple choice questions, each with five possible answers, only one of which is correct. find the mean and the standard deviation of the number of correct answers. Detailed solution. download solution pdf. given: a test consists of 25 mcqs. each correct answer gives 4 marks and incorrect answer gives 1 mark. the candidate has got 74 marks. calculation: method 1 hit and trial method. let the number of questions with correct answers, incorrect answers and unattempted be a, b, c respectively.
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