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• ## Discussion

 0 answersPost by Xiang Dong on March 31 at 07:13:54 AMI have a question, in example 3 of geometpdf or geomcdf, you didn't include 0 person. But in examples of binomial, you included 0 person. So what's the difference? And should we include 0? 0 answersPost by Xiaming Jin on April 25, 2016Hi,How do you get formula of variance of binomial distribution?Why Var(x)=np(1-p)?And for geometric distribution, I can't understand for both expected value and variance.Could you give me some explanation?Thanks a lot.

### Discrete Random Variables

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Objectives 0:08
• Binomial Distribution 0:14
• BINP
• B
• I
• N
• P
• Example I: Binomial Distribution 1:43
• Question 1: Is a Binomial Distribution a Reasonable Probability Model for the Random Variable X?
• Question 2: Is a Binomial Distribution a Reasonable Probability Model for the Random Variable X?
• Binomial Probability 5:11
• Binompdf (n, p, x)
• Example II: Determine the Probability 10:37
• Part A: Determine the Probability that Exactly One of the Toasters is Defective
• Part B: Determine the Probability that At Most Two of the Toasters are Defective
• Part C: Determine the Probability that More Than Three of the Toasters are Defective
• Geometric Distribution 24:11
• Geometric Distribution
• Example III: Geometric Distribution & Probability 25:14
• Part A: Geometric Distribution
• Geometric Probability 26:55
• Geometpdf (p, x)
• Example III: Geometric Distribution & Probability 27:50
• Part B: Geometric Probability of Exactly Four Patients
• Part C: Geometric Probability of At Most Five Patients
• Mean and SDs 33:47
• Binomial
• Geometric
• Example IV: Defective Units 34:53
• Example V: Number of Patients 35:58