There were two movies in that lesson. Here they are for you. I will go and correct it in the lesson itself as well. Thank you for letting me know.

This is the first movie: "Normal Distribution Curve"

http://river.stgabe.com/SG-Movies/SGHighSchool/Math/math30Applied/u2L3obj1_pg71_E.mov

This is the second movie: "Characteristics of normal distribution"