According to the national health survey, 9.8 % of the population of 18-24 year olds in the us are left-handed. supposed you select 10 individuals form this popoulation and x is the number of persons who are left handed. how many left-handed people are expected to be selected? what is the variance and standard deviation of x? what is the probability that exactly 4 people are left-handed? what is the probability that at least 4 people are left-handed? what is the probability that at most two people are left-handed? given that at least 4 people are left-handed, what is the probability that exactly 4 are left-handed?