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• ## Related Books

 0 answersPost by Kamto Nzelu on May 23, 2014The final answer in this lecture is 1.216 cars. I'm curious as to whether that was rounded to 3 decimal places, or if that was the raw answer? Oh and if so, is it standard practice to round to 3 decimal places? 1 answerLast reply by: John MyersWed Feb 22, 2012 12:35 AMPost by Chaya Einhorn on December 21, 2011How did you get the probability of winning \$499 is 1/1000? Where does the 1000 number come from? 0 answersPost by Melissa Bonner on November 3, 2011i'm having trouble figuring out how you found the probabilities =( 2 answersLast reply by: Angela PatrickFri May 9, 2014 12:29 AMPost by Diana Luong on July 21, 2011How is this .999?

### Mean and Standard Deviation of a Discrete Random Variable

• The mean of a discrete random variable is .

• The standard deviation of a discrete random variable is

• When using the “easier” equation for the standard deviation, do not forget to subtract from .

### Mean and Standard Deviation of a Discrete Random Variable

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
• Mean of a Discrete Random Variable 0:10
• Example
• Example: Numbers Game 3:09
• Standard Deviation of a Discrete Random Variable 6:02
• Example
• Example: Cars in a Town 10:12
• Extra Example 1
• Extra Example 2