to determine if it is even replace x with -x and see if the answer is identical.
In this case, this function is even
Area under ALL probability distribution curves is 1.0, because all possible outcomes are taken into account.
1 hour=1/6+1/6+1/6
1 hour=3/6
1 hour=1/2
for every hour, the snail moved 1/2 a foot
