Предмет: Алгебра, автор: Аноним

Теория вероятностей элементы комбинаторики

Приложения:

Ответы

Автор ответа: Аноним
0

В туристической группе 10 человек, причем 4 из них мужчины. С помощью жребия выбирают двоих ночных дежурных у костра. Какова вероятность того, что все дежурные окажутся мужчинами? Ответ округлите до тысячных.

Решение:

Вероятность выбрать первого мужчину равна 4/10 = 2/5. Останется всего 9 человек из них 3 мужчины, тогда вероятность выбрать второго мужчину равна 3/9 = 1/3. По теореме умножения, вероятность того, что оба дежурные окажутся мужчинами, равна P = 2/5 * 1/3 = 2/15 ≈ 0.133

Ответ: 0,133.

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Задание.Study general free time activities and their definitions. Translate them.

Surf the internet - On the internet, you can research a topic you are interested in using a search engine, visit your favourite websites, watch music videos, create your own video and upload it for other people to see, maintain contact with your friends using a social networking site, write your thoughts in a blog, learn what is happening in the world by reading news websites, etc.
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Play a musical instrument - Learn to play the piano, guitar, violin, cello, flute, piano accordion, mouth organ, panpipes, clarinet, saxophone, trumpet, etc. You can play on your own or with a group, such as a band or an orchestra.
Listen to music - Turn up the volume and listen to your favourite type of music, such as pop, rock, hip hop, rhythm & blues, blues, jazz, classical, soul, heavy metal.
Read - Many people love to read both fiction and non-fiction books and magazines. If you like fiction, you can read novels, short stories, crime fiction, romance, etc. If you like non-fiction, you can read biographies, autobiographies, or books on history, science, philosophy, religion, or any other topic you are interested in.
Write - Many people like to write in their diary. Another name for a diary is a journal. You can also write many other things, such as poetry, novels, letters, short stories, etc. (See under Read for more options).