A machine for filling 2-liter bottles of soft drink delivers an amount to each bottle that varies from bottle to bottle according to a normal distribution with standard deviation 0.002 liter and mean whatever amount the machine is set to deliver.

Question

A machine for filling 2-liter bottles of soft drink delivers an amount to each bottle that varies from bottle to bottle according to a normal distribution with standard deviation 0.002 liter and mean whatever amount the machine is set to deliver.
If the machine is set to deliver 2 liters (so the mean amount delivered is 2 liters) what proportion of the bottles will contain at least 2 liters of soft drink?
Find the minimum setting of the mean amount delivered by the machine so that at least 99% of all bottles will contain at least 2 liters.

PsyDAG · Answer

50% Look at Z score table in the back of the statistics text for 99% probability and its Z score. Insert Z score into equation below. Z = (score-mean)/SD