Average means the sum divided by the number of items.<br><br>
&bull; Sum = 10 + 10 + 10 = 30<br>
&bull; Number of items = 3<br>
&bull; Average = 30 ÷ 3 = 10<br>
&bull; 10 is not among the options 11, 9, or 12.<br><br>
Final Answer: None of the above