In this task you will be given a list of numbers and you need to find the mean (average) of that list. The mean of a list can be found by summing every number in the list then dividing the result by the size of that list. The output should be rounded to 3 decimal places.
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Question: [21.531, 221.161, -31.194]

Answer: 70.499


Question: [219.428, 229.08, 24.616, -83.165, -28.839, 195.219, 170.491, -78.673]

Answer: 81.02


Question: [223.955, 41.858, -54.86, 8.742, 110.448]

Answer:
66.029