Answer
a. $1/15$
b. $1/3$
c. $5/6$
d. $5/6$
e. $1/3$
Work Step by Step
a. The patient has had exactly 2 tests done.
$p=2/30=1/15$
b. The patient has had at least 2 tests done.
$p=(2+3+5)/30=1/3$
c. The patient has had at most 3 tests done.
$p=25/30=5/6$
d. The patient has had 3 or fewer tests done.
$p=25/30=5/6$
e. The patient has had 1 or 2 tests done.
$p=(8+2)/30=1/3$
