Color-blindness 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 (). color-blindness is gender-based, with 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 color-blind. let y be the number of females (out of the 40) who are color-blind. let z be the total number of color-blind individuals in the sample (males and females together). which of the following is true about the random variables x, y, and z? x is binomial with n = 20 and p = .08. y is binomial with n = 40 and p = .01. z is not binomial. all of the above are true. only (a) and (b) are true.