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 color-blindness, 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 regarding the random variables x and y?
a. both x and y can be well-approximated by normal random variables. b. only x can be well-approximated by a normal random variable. c. only y can be well-approximated by a normal random variable. d. neither x nor y can be well-approximated by a normal random variable.