Colorblindness is any abnormality of the color vision system that causes a person to see colors differently than most people,

Colorblindness is any abnormality of the color vision system that causes a person to see colors differently than most people, or to have difficulty distinguishing among certain colors (www.visionrx). Colorblindness is gender-based, while the majority of sufferers being males. Roughly 8% of white males have some form of colorblindness, while the incidence among white females is only 1%. A random sample of 20 white males and 40 white females was chosen. Let X be the number of males (out of the 20) who are colorblind. Let Y be the number of females (out of the 40) who are colorblind. Let Z be the total number of colorblind individuals in the sample (males and females together). What is the probability that exactly 2 of the 20 males are colorblind


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