Question 1206541
to be reviewed and re-posted when more time is available.
stay tuned.


80% of the total are actually good.
20% of the total are actually defective.


10% of the good are mis-classified as defective.
10% * 80% = 8% that are mis-classified as defective.
that leaves 80% minus 8% = 72% that are correctly classified as good.


10% of the defective are mis-classified as good.
10% * 20% = 2% that are mis-classified as good.
that leaves 20% minus 2% = 18% that are correctly classified as defective.


you have 72% that are correctly classified as good and 2% that are incorrectly classified as good for a total of 74% classified as good.


you have 18% that are correctly classified as defective and 8% that are incorrectly classified as defective for a total of 26% classified as defective.


totals look good.


80% actually good plus 20% actually defective = 100% total.
74% classified good plus 26% classified defective = 100% total.


this agrees with my original assessment.
let me know if you have any questions or concerns.
theo