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Answer:
The answer is 18.5.
Explanation:
First, we have to add them all.
7 + 12 + 21 + 34 = 74
Next, we divide the sum by how many numbers we added (we added four numbers).
74 / 4 = 18.5.
I hope this helped! :-D
Step-by-step explanation: once you add up all the numbers you get 74. To find the mean add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count. Once you divide, you will get 18.5 as the answer for the mean