Binomial distribution formulae?

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Homework Help Overview

The discussion revolves around the calculation of the mean of a random variable M defined by a probability mass function (p.m.f.) and the application of binomial distribution formulae. Participants are exploring the appropriate methods for finding the mean and questioning the relevance of the binomial distribution in this context.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to calculate the mean using the provided p.m.f. and questioning the correctness of their calculations. Some express confusion about the appropriate distribution to use, particularly in relation to their background in behavioral sciences.

Discussion Status

The discussion is ongoing with participants providing insights into the correct approach to calculating the mean. There is a recognition of the need to clarify the use of the binomial distribution in this scenario, and some guidance has been offered regarding the p.m.f. and its implications for finding the mean.

Contextual Notes

Some participants indicate a lack of familiarity with the problem due to their academic background, which may influence their understanding of the distribution and calculations involved.

morr485
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1. Let the p.m.f. pf M be defined by f(m)=x/8, x=1,3,4. What is the mean of M?
2. n!/n-r*p^n*(1-p)^n-r
3. 3!*1/3^3*2/3^2=.59 This is not the correct answer!
 
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That isn't the correct answer because you aren't using the correct expression for calculating the mean. Why are you using the binomial distribution formulae?
 


D.H.

What distribution of equation should I use? I'm from the behavioral sciences and I
am not familiar with this problem.
 


The problem tells you what to use! The probability is given by f(m)=x/8, x=1,3,4. That is, f(1)= 1/8, f(3)= 3/8 and f(4)= 4/8= 1/2. And the mean is given by [itex]\sum x f(8)[itex].[/itex][/itex]
 

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