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12/12/17, 12:07 AMPrint TestPage 1 of 7PRINTABLE VERSIONTest 2You scored 24 out of 46Question 1Your answer is INCORRECT.A service center receives an average of 0.8 customer complaints per hour. Management's goal is toreceive fewer than three complaints each hour. Assume the number of complaints follows the Poissondistribution. Determine the probability that exactly four complaints will be received during the nexteight hours.a) 0.235b) 0.116c) 0.008d) 0.765e) 0.999f) None of the above.Question 2Your answer is CORRECT.Given the cumulative distribution:Determine Q1, the first quartile.F(x) =⎧⎩⎨⎪⎪0x−11101x< 1010≤x≤20x> 20
12/12/17, 12:07 AMPrint TestPage 2 of 7Question 3Your answer is CORRECT.The average life a manufacturer's blender is 5 years, with a standard deviation of 1 year. Assumingthat the lives of these blenders follow approximately a normal distribution, find the probability that themean life a random sample of 25 such blenders falls between 4.5 and 5.2 years.Question 4Your answer is INCORRECT.An electrical firm manufactures light bulbs that have a length of life that is approximately normallydistributed with a standard deviation of 50 hours. How large a sample is need if we wish to be 95%confident that we will be within 12 hours of the true mean?