A product is considered satisfactory if it makes, on average, no more than 0.30 error per hour.  The product is to be tested in a given 4-hour period. It is considered satisfactory if no more than  2 errors occur during this time period A. Using this test, what is the probability that a satisfactory  product will be flagged as unsatisfactory B. If the mean number of errors is 0.35 per hour, what is the  probability that a product is satisfactory

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