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ASK THE PROFESSOR FORUM

Course Documents

Chapter 1 - Intro

Chapter 2 - Methods for Describing Sets of Data

Chapter 3 - Probability

Chapter 4 - Discrete Random Variables

Chapter 5 - Normal Random Variables

Chapter 6 - Sampling Distributions

Chapter 7 - Confidence Intervals

Chapter 8 - Tests of Hypothesis: One Sample

Chapter 9 - Confidence Intervals and Hypothesis Tests: Two Samples

Sample Exam I: Chapters 1 & 2

Sample Exam II: Chapters 3 & 4

Sample Exam III: Chapters 5 & 6

Sample Exam IV: Chapters 7 & 8

Ask the Professor Forum

Hi professor, Can you explain number 45 from chapter 4 mixed review. I think I am going wrong in Finding what is in the x column. I originally used the 25,7,5,and 4.

Posted to STATS 1 on Sunday, October 19, 2014   Replies: 1


Professor Mcguckian
10/19/2014
8:46 PM EST

Hi Reina,

Remember, the person must pay $5 for the chance to draw a marble from the bag. The problem does not say they will profit $25, $7, 5$, or $4. It says they will receive these amounts depending on which color they draw. If they receive $25, they only profit $20 because they paid $5 to play.

X P(X)
$20 2/80
$2 6/80
$0 18/80
-$1 54/80

Hope this makes sense,

Professor McGuckian

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