A school district is interested in attendance for
students in middle and high school. The results
for one day are summarized in the table.
a) If a student is selected at random, what is
the probability that they are a middle
school student who was present?
students
students
total
present
absent
middle school
8.600
1,300
9.900
high school
total
10,500
2.100
12,600
19.100
3,400
22.500
b) If a student is selected at random, what is the probability they are in middle school or absent?
c) If high school student is selected at random, what is the probability that they were absent?
d) If a student who was present that day is selected at random, what is the probability that they
are in middle school?