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PPM (error of 1 million pieces of products) is the unit used to measure the error rate properties
of the product. PPM is calculated using the formula:
a. Number of pieces of error * 1,000,000 / total sample test
b. (The number of pieces of error / total number of samples tested) * 100%
c. Number of pieces of error * 1,000,000 / total production pad in 1 case
d. Errors discovered some pieces in 1 shift of production * 1,000,000 / total ice pieces are produced in 1 case
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