A professor with 400 students has each anonymously write down how many siblings each of them has. The distribution that results is given below:
# OF STUDENTS 0 1 2 3 4 5 6 7
PROPORTION 0.16 0.295 0.18 0.1375 0.1025 0.0775 0.375 0.01
1) If the professor randomly selects one student what is the probability that they have at least 3 siblings?