In a certain class of students there are 11 boys from Wilmet

In a certain class of students, there are 11 boys from Wilmette, 4 girls from Winnetka, 7 girls from Wilmette, 4 boys from Glencoe, 5 boys from Winnetka and 4 girls from Glencoe. If the teacher calls upon a student to answer a question, what is the probability that the student will be a boy?

0.571

0.429

0.71

0.314

Solution

Total students=11+4+7+4+5+4=35

total boys=11+4+5=20

p(e)=20/35=0.57