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Консультация № 197204
26.11.2019, 00:20
0.00 руб.
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Студент, отправляясь на экзамен, подготовил ответы на 30
вопросов из 50. Найти вероятность того, что из трех заданных ему вопросов
он ответит хотя бы на два.
Студент, отправляясь на экзамен, подготовил ответы на 30
вопросов из 50. Найти вероятность того, что из трех заданных ему вопросов
он ответит хотя бы на два.
Обсуждение
30.11.2019, 15:36
общий
это ответ
Здравствуйте, kalashnikovaph!
Воспользуемся формулой Бернулли: если вероятность некоторого события равна p, то вероятность того, что при n испытаниях событие произойдёт ровно m раз (0[$8804$]m[$8804$]n), равно
В данном случае p = 30/50 = 0.6, n = 3 (количество вопросов) и вероятность правильного ответа ровно на m вопросов для разных m составит
Нас интересует вероятность того, что количество правильных ответов не меньше 2, то есть равно 2 или 3. Она будет равна
Воспользуемся формулой Бернулли: если вероятность некоторого события равна p, то вероятность того, что при n испытаниях событие произойдёт ровно m раз (0[$8804$]m[$8804$]n), равно
В данном случае p = 30/50 = 0.6, n = 3 (количество вопросов) и вероятность правильного ответа ровно на m вопросов для разных m составит
Нас интересует вероятность того, что количество правильных ответов не меньше 2, то есть равно 2 или 3. Она будет равна
Форма ответа
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