For this case, we must indicate how many students there are in the class knowing that it includes 14 "lefties". For this, we make a rule of three:
20 -------------> 4
x ---------------> 14
Where the variable "x" the number of students in the class.
[tex]x = \frac {14 * 20} {4}\\x = \frac {280} {4}\\x = 70[/tex]
Thus, if the class includes 14 left-handers, then according to the base average, the class will have a total of 70 students.
Answer:
70 students
