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[Music] in the previous video we learned about the Gaussian curve and how data points when fall in the normal distribution when you have material that you are using it has been held stable and your analytical system is stable you will see all your data points fall in the Gaussian curve but how does that apply in the laboratory that is what we see in this video and Im sure all of you would have heard of levey-jennings charge which is generally called the LJ chart and that is what graphically representing your data in the lab using the Gaussian principle lets see how this happens levey-jennings lets examine the history of the levey-jennings briefly w watt an american physicist and engineer and statistician in 1931 proposed applying statistical base control charts to interpret industrial manufacturing processes and in 1950 Levy and Jennings suggested the use of XI watts control chart in clinical laboratories so now lets go back to our Gaussian I hope you remember the basic principles