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Finding the mean
Code
<_data >
<foo >1</foo>
<foo >2</foo>
<foo >3</foo>
<foo >4</foo>
<foo >5</foo>
<foo >6</foo>
<foo >7</foo>
<foo >8</foo>
<foo >9</foo>
<foo >10</foo>
</_data>

# avg(foo) #
Output

5.5
Ref

x.5501

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