I was reading through my"Random Variability in Business Situations" notes and wanted to enquire about some difficulty I've encountered.
On the fourth and final column "probability calculated from model X~N (53, 2^2)" how are the values determined? What steps are taken? Because from "X is greater then/equal to 47 and less than 48" there is a 0.0003 difference between the last two columns (0.0048 and 0.0045). I am very interested to understand why this is happening.
The mean weight is 53g and the standard deviation is 2g. Please refer to the image below for reference.