Noah bought several books. The cost of each book was
$
11.55
\displaystyle \${11.55}
$
11.55
,
$
23.65
\displaystyle \${23.65}
$
23.65
,
$
12.04
\displaystyle \${12.04}
$
12.04
,
$
17.38
\displaystyle \${17.38}
$
17.38
, and
$
20.44
\displaystyle \${20.44}
$
20.44
. What is the mean price of the books Noah bought?
$
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