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Coding Error with statistics interview questions

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I'm having a problem with the code for statistics interview questions from here. I am getting an error when I try to run the code. The error message I'm seeing is:
"SyntaxError: invalid syntax (line 5, col 4)"
Here is a snippet of the code I'm running:

def find_mean(arr):
    sum = 0
    for element in arr
        sum += element
    return sum/len(arr)

Any help in resolving this issue would be greatly appreciated. Thanks!

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