business calculations

albino rats used to study the hormonal regulation of a metabolic pathway are injected with a drug that inhibits body synthesis of protein. usually, 4 out of 20 rats die from the drug before the experiment is over. this time round, 10 animals are treated with the drug. what is the probability that 5 of these animals will die before the experiment is over?

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  1. 0.2

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  2. 0.0264

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  3. exactly 5, or at least 5?

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