Show exactly what you entered in to the TI-84 calculator to arrive at your result, including what function you used and what numbers you entered. Round all decimals to 3 places.
A. Student grade point averages at Bryce College are normally distributed with mean 2.6 and standard deviation 0.5.If a random sample of size 100 is taken from the student population, what is the probability that the sample mean will be between 2.5 and 2.7?

B. The 20 members of the gaming club have a mean grade point average of 2.9. Is it unusual for a sample of 20 students to have a GPA of 2.9 or greater? (Recall that an event is unusual if it occurs with probability less than 0.05.)