The frequency distribution shown here illustrates the number of medical tests conducted on 30 randomly selected emergency patients.
Number of tests Number of
performed patients
0.......... 12
1 ............8
2 ............2
3 ............3
4 or more .......5
If a patient is selected at random, find these probabilities.
a. The patient has had exactly 2 tests done.
b. The patient has had at least 2 tests done.
c. The patient has had at most 3 tests done.
d. The patient has had 3 or fewer tests done.
e. The patient has had 1 or 2 tests done