Although there is some controversy, tongue rolling (the ability to roll the edges of thetongue into a loop) is generally thought to be a genetic trait. Another genetic trait is earlobeattachment. Some people have the earlobe attached to the side of the head; others have earlobesthat hang freely. In a class of 80 students, 38 could not roll their tongue, 31 had attachedearlobes, and 15 could roll their tongues and had attached earlobes. A student is randomlyselected from the class, and whether or not the student can roll his or her tongue and whether ornot his or her earlobe is attached are observed. LetTrepresent the event that the selectedstudent can roll his or her tongue andErepresent the event that the student has attachedearlobes. Symbolically denote the following events and identify the number of studentsrepresented by each. a. The student can roll his or her tongue.
b. The student can neither roll his or her tongue nor has attached earlobes.
c. The student has attached earlobes but cannot roll his or her tongue.
d. The student can roll his or her tongue or has attached earlobes but not both.