Abstract
ABSTRACT A method was developed to analyze the probability of error when produce grade defect percentages are based on the custom of using an assumed incoming sam-ple mass in a standard size container. A plot of grade defect mass vs. incoming sample mass yields isoerror curves that indicate the level of error for a chosen com-bination of grade defect and incoming sample masses. Superimposing normal curves representing a range of in-coming sample mass distributions permits calculation of the points needed for a 3-D plot of the probability of a correct grade defect percentage as a function of the mean and standard deviation of the incoming sample mass distribution with the grade defect mass and level of error as implicit variables. The method was found reliable for predicting the amount of error at a commerical tomato grading station. The results provide information needed to decide if mass determinations of the incoming sample should be required.
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