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An antibiotic is effective against a particular strain of streptococcus 70% of the time. What is the probability that at least 70 out 100 cases

  1. An antibiotic is effective against a particular strain of streptococcus 70% of the time. What is the probability that at least 70 out 100 cases will respond when treated with this antibiotic
  2. A novice competitor in biathlon hits 80% of her targets. What is the probability that she will hit more than 45 out of 50 targets attempted?

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