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4125. The store receives goods, 80% of which are of the 2019

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4125. The store receives goods, 80% of which are of the first grade. How many products need to be taken so that with a probability of 0.997 one could argue that the frequency of products of the first grade will be in the range from 0.75 to 0.85?

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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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