With respect to in-line inspections and floor inspections, prunes in a particular lot shall, subject to the other applicable requirements of this section, be considered as being according to a particular size category prescribed in § 993.515 if the average size count of the prunes in such lot falls within the range of the size counts specified for such size category, and the count per pound of 10 ounces of the smallest prunes in a sample of 100 ounces varies from the count per pound of 10 ounces of the largest prunes in such sample by no more than 45 points.