A contest is being held at a school fair for seventh-grade and eighth-grade students.
• There are 40 seventh-grade students at the fair.
• There are 30 eighth-grade students at the fair.
Each student's name was written on one card and placed
into a box. The principal will reach into the box and pick
one card without looking. The student named on the card
will be the winner of the contest. What is the probability
that the winner of the contest will be an eighth-grade
student?
a. 1/2
b.3/4
c. 3/7
d. 1/30