FYI: Means-Per-Unit (MPU)

** Useful when difference or ratio estimation cannot be used—for example, for inventory when perpetual records do not exist (i.e., there is no “book” value for each individual sample item).** Estimate the population's implied audit value. 1. Calculate the average audit value for items in the sample: MPU = av/n 2. Multiply that average (MPU) times the number of items in the population: AV = MPU * N