Approximately 10% of all people are left-handed ("11 little-known facts," 2013). consider a grouping of fifteen people. a.) state the random variable. x = ____________________________ b.) show that this is a binomial. find the probability that c.) none are left-handed. d.) seven are left-handed. e.) at least two are left-handed. f.) at most three are left-handed. g.) at least seven are left-handed. h.) find the mean of x. i.) find the variance of x. j.) find the standard deviation of x.