An important part of the customer service responsibilities

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1. A large disaster cleaning company estimates that 30% of the jobs it bids on are finished within the bid time. Looking at a random sample of 8 jobs that is has contracted: Calculate the mean number of jobs completed within the bid time.

2. Your company's internal auditor believes that 10% of the company's invoices contain error, To check this theory, 20 invoices are randomly selected and 5 found to have error. What is the probability that of the 20 invoices written, five or more would contain error if the theory is valid?

3. An important part of the customer service responsibilities of a cable company relates to the speed with which trouble in service can be repaired. Historically, the data show that the likelihood of 0.75 that troubles in a residential service can be repaired on the same day. For the first five troubles.....

4. In a study conducted by a local University, it was found that 25% of college freshmen support increased military spending. If 6 college freshmen are randomly selected, find the probability that: Fewer than 4 support increased military spending.

5. A multiple-choice test has 30 questions and each one has five possible answers, of which one is correct. If all answers were guesses, find the probability of getting exactly four correct answers.

Reference no: EM13459210

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