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Probability Mass Function

Statistics
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Suppose you sample from an urn with 12 red balls and 6 green balls. You choose three balls without replacement.

What is the Probability Mass Function (PMF) for the number of red balls drawn? What is the mean and standard deviation?

Apr 27th, 2015

probability mass function for the red balls = 12/(12+6) = 0.66

The  mean is the average values  which can be calculated using following formula.

 here n is the sample size and the x correspond to the observed valued.

where standard deviation ..



 

Apr 27th, 2015

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Apr 27th, 2015
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Apr 27th, 2015
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