this is 2nd lecture of normal distribution link of first lecture is given in the end. this lecture highlight the idea of standard normal distribution, why it is important. how it is use to find probability. it also give the idea how to use the area table to work out probability or area of given range. for building good concept also see Normal Probability Distribution I lecture
link of this previous lecture of Normal Distribution
ua-cam.com/video/s0ZlJfhiGnw/v-deo.html