A lab manager is trying to find out the number of defected items produced in two different shifts: Day Shift as well as Night Shift. Let the average number of defected items in the Day Shift is 20 out of 2000 items and that in the Night Shift is 15 out of 1300 items. Let defectiveness of item follows a poisson distribution. If you're given random group of 10 items (all are only from either Night Shift or Day Shift) and 2 of them are defected, find the most-likely-hood ratio and also find out both the kinds of errors.