A student conducts a survey for her class project. She asks 5 other students a series of questions about their study habits. She knows from previous research that all students study an average of 2.74 hours per day. If students in her own sample study an average of 3.13 with a standard deviation of 1.84 hours per day, then what is the probability of observing this sample mean or greater?

a) 0.32

b) 0.96

c) 0.9

d) 0.78

e) 0.22