A counsellor, new to college was informed that students register an average of 12.4 credits each semester. Assume the standard deviation of credits registered is 1.8 credits. The counsellor who wants to check, randomly samples 40 students, collects the credits registered by them this semester and computes sample meanX (average).

1. The mean of X is
2. The standard deviation ofX is . Round to 2 decimals. Use these for #3.
3. Find the probability that, among the 40 students, the mean credits registered is more than 13 credits. Round to 2 decimals.