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20.02.2022 •
Mathematics
19. A manufacturer of light bulbs knows that, out of every package of 5 sold, there is an expectation that 1 will be defective. A customer purchases 3 of these packages (a total of 15 light bulbs). What is probability that at most 2 are defective
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Ответ:
4:x = 28:42
x × 28 = 4 × 42
28x = 168
x = 168/28
x = 6