Предмет: Математика, автор: VALERA1201

С первого станка поступает 70% всех деталей, а со второго - 30%. Среди деталей первого станка 4% брака, а второго - 5%. Тогда вероятность того, что поступившая на сборку деталь качественная равна

Ответы

Автор ответа: неформальчик

пусть: всего производится Х деталей, тогда формула производства бракованных деталей будет выглядеть так: 0,7Х*0,04+0,3Х*0,05=0,028Х+0,015Х=0,043 или 4,3% всех деталей - брак
найдем процент годных деталей: 100%-4,3%=95,7%
                                                            4,3
отношение брака к годным будет:    -------
                                                           95,7

вероятность что качественная 957

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A Shoemaker’s shop
One afternoon many years ago, George Cox robbed Barcleys Bank. He stole over 50.000 pounds. But unfortunately, when he came out of the bank, the police were waiting for him. George was arrested and sentenced to 25 years in prison.
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“Yes, that’s right! You mean you’ve got them?”
“Oh, yes. I’ve still got them”, said the shoemaker. “They will be ready on Friday”.

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