Question

Q3.(12) 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 first to contain an error?

  2. What is the probability that the supervisor will inspect between two and six (inclusive) telephone orders before finding an error?

  3.  What is the probability that the inspector will examine at least seven orders before finding an error?

  4. Suppose the first four telephone orders contain no errors, what is the probability that the first error will be on the eighth order or later?thank you very much 

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