A review of emergency room records at rural Millard Fellmore Memorial Hospital was performed to determine the probability distribution of the number of patients entering the emergency room during a 1-hour period.

The following table lists this probability distribution.

Patients per hour Probability

0 - 0.2725

1 - 0.3543

2 - 0.2303

3 - 0.0998

4 - 0.0324

5 0.0084

6 0.0023

Determine the probability that the number of patients entering the emergency room during a randomly selected 1-hour period is

a) 2 or more

b) exactly 5

c) fewer than 3

d) at most 1