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7/15/2018Print Test1/6PRINTABLE VERSIONTest 2 (Session 3)You scored 6 out of 48Question 1Your answer is INCORRECT.A service center receives an average of 0.8 customer complaints per hour. Management's goal is to receivefewer than three complaints each hour. Assume the number of complaints follows the Poisson distribution.Determine the probability that exactly four complaints will be received during the next eight hours.a) 0.235b) 0.116c) 0.008d) 0.765e) 0.999f) None of the above.Question 2Your answer is INCORRECT.Given the cumulative distribution:Determine Q1, the first quartile.
7/15/2018Print Test2/6Question 3Your answer is INCORRECT.The average life a manufacturer's blender is 5 years, with a standard deviation of 1 year. Assuming that thelives of these blenders follow approximately a normal distribution, find the probability that the mean life arandom 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 70 hours. How large a sample is need if we wish to be 98% confidentthat we will be within 11 hours of the true mean?