Given a list of numbers, remove the largest and smallest numbers, and calculate the average of the remaining numbers.
trimmed_averages([4, 5, 7, 100]) ➞ 6
# Average of 5 and 7
trimmed_averages([10, 25, 5, 15, 20]) ➞ 15
# Average of 10, 15 and 20
trimmed_averages([1, 1, 1]) ➞ 1
# 1