When a compressor pumps one CFM (cubic foot per minute), that means the intake port inhales one cubic foot of free air (air at atmospheric pressure, which is 0 psig) per minute. (Note: A CFM does not mean in any sense the compressed volume.) So the unit really measures the mass of air flowing per minute, not volume per minute, since a cubic foot of free air is a unit of mass.
This second scale has a mean and standard deviation that have been arbitrarily set. A z score, for example, is a raw score that has been transformed to a scale with a mean of 0 and a standard deviation of 1.
Each row of the Z-score table shows the Z-scores up to the tenths digit. Each column further refines the Z-score to the hundredths digit. For instance, to find the N(Z) value for Z = 0.46, first locate the row of 0.4.Then, locate the 0.06 column. Where the row and column intersect is the value for 0.46.From the table below, you can see that N(0.46) = 0.6772.ach column further refines the Z-score to the hundredths digit. For instance, to find the N(Z) value for Z = 0.46, first locate the row of 0.4. Then, locate the 0.06 column. Where the row and column intersect is the value for 0.46.