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For more information, please see full course syllabus of Statistics
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Lecture Comments (7)

0 answers

Post by Kamto Nzelu on May 23, 2014

The 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 answer

Last reply by: John Myers
Wed Feb 22, 2012 12:35 AM

Post by Chaya Einhorn on December 21, 2011

How did you get the probability of winning $499 is 1/1000? Where does the 1000 number come from?

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Post by Melissa Bonner on November 3, 2011

i'm having trouble figuring out how you found the probabilities =(

2 answers

Last reply by: Angela Patrick
Fri May 9, 2014 12:29 AM

Post by Diana Luong on July 21, 2011

How 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