12. A supplier delivers an order for 20 electric toothbrushes to a store. By accident, three of the electric toothbrushes are defective. What is the probability that the first electric toothbrush sold defootuo?

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Q: For the sample: 45 84 73 58 54 73 52 60 51 80. Determine the variance and round answer to 2 decimal ...

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Q: none of the rolls show 1 spot?

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