以下代码，要求通过调用函数mean计算出列表元素的平均值，并输出。请完善代码。
def mean(numlist):
s = 0.0
for num in numlist:
s = s + num
return s/len(numlist)
ls = [11,43,23,37,61,29]
print("平均值为：",【 】)
def mean(numlist):
s = 0.0
for num in numlist:
s = s + num
return s/len(numlist)
ls = [11,43,23,37,61,29]
print("平均值为：",【 】)
举一反三
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