[tex]\bold{\overline{X}= \dfrac{\displaystyle\sum_{i=1}^{9}x_i}{9} }[/tex]
[tex]\boxed{\bold{\overline{X}=12.555555555555555} }[/tex]
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[tex]\bold{\overline{X}= \dfrac{\displaystyle\sum_{i=1}^{9}x_i}{9} }[/tex]
[tex]\boxed{\bold{\overline{X}=12.555555555555555} }[/tex]