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What is the probability that the third telephone order

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One store notes that the probability of some type of error in a telephone order is 0.2. A supervisor randomly selects telephone orders and carefully inspects each one.

  1. What is the probability that the third telephone order selected will be the ?rst to contain an error?
  2. What is the probability that the supervisor will inspect between two and six (inclusive) telephone orders before ?nding an error?
  3. What is the probability that the inspector will examine at least seven orders before ?nding an error?

Reference no: EM132464881

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