The number of seconds X after the minute that class ends is uniformly distributed between 0 and 60. Round all answers to 4 decimal places where possible.

What is the distribution of
X?X ~ U( , )
then the sampling distribution is
Suppose that 35 classes are clocked. What is the distribution of

for this group of classes?
~ N( , )

What is the probability that the average of 35 classes will end with the second hand between 23 and 32 seconds?