Determining percentages of calls which are completed

Reference no: EM1315297

Q1) Fix-It Copiers advertises mean time of 100 minutes for office calls with standard deviation of 25 minutes. What percentages of calls are completed?

a) Between 100 and 120 minutes?

b) In less than 120 minutes?

c) In less than 60 minutes?

d) Between 120 and 150 minutes?

e) Between 60 and 120 minutes?

f) Twenty percent of their jobs take more than how much time?

Q2) A certain printer cartridge has illustrated the mean time usage of 9 hours and a standard deviation of 22 minutes. What time usage guarantee (in hours) must the manufacturer advertise to make sure that only 4% of cartridges fail to meet guaranteed time usage?

Reference no: EM1315297

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