A salesperson finds that, in the long run, two out of five sales calls are successful. Twelve calls are to be made. Let X= the number of concluded sales. Is X a binomial random variable? Explain! 6) A new treatment for baldness is known to be effective in 70% of the cases treated. Four bald members of the same family are treated. Let X= the number of successfully treated members. Is X a binomial random variable?