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n people drop their cell phones in a box, then randomly pick their cell phone by putting their hands in the box. Let X be the random variable representing the number of people pulling their cell phones right: a.What is the average value of the random variable X if we know that the first person to draw is the correct one? What is the variance? b.lf we know that 2 people from the first (n-1) people picked up the phone correctly, what is the average of the nth person picking up the phone correctly?

n people drop their cell phones in a box, then randomly pick their cell phone by putting their hands in the box. Let X be the random variable representing the number of people pulling their cell phones right: a.What is the average value of the random variable X if we know that the first person to draw is the correct one? What is the variance? b.lf we know that 2 people from the first (n-1) people picked up the phone correctly, what is the average of the nth person picking up the phone correctly?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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n people drop their cell phones in a box, then randomly pick their cell phone by putting their hands in the box. Let X be the random variable representing the number of people pulling their cell phones right: a.What is the average value of the random variable X if we know that the first person to draw is the correct one? What is the variance? b.lf we know that 2 people from the first (n-1) people picked up the phone correctly, what is the average of the nth person picking up the phone correctly?
Transcribed Image Text:n people drop their cell phones in a box, then randomly pick their cell phone by putting their hands in the box. Let X be the random variable representing the number of people pulling their cell phones right: a.What is the average value of the random variable X if we know that the first person to draw is the correct one? What is the variance? b.lf we know that 2 people from the first (n-1) people picked up the phone correctly, what is the average of the nth person picking up the phone correctly?
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