There will be 28 documents to verify the process of the central limit theorem of the specific probability distribution distribution. This video is the first case, Normal distribution. Get e-book: https://www.amazon.com/dp/B09PFFN622 or scan the QR code. Research method: there are five methods to verify the central limit theorem on the case of Normal distribution. (p.29~31) (1) Verify the Z-score distribution, using the probability distribution simulator. (2) Verify whether the moments are affected by n, using the probability distribution simulator. (3) The first explained method by displaying the relationship of Xn and X1 + ... + Xn-1 (4) The second explained method by displaying the relationship of the front half of (X1, ..., Xn) and the rear half of (X1, ..., Xn) (5) Compare the Z distribution and the Z-score of the sample mean.