Erika is tracking the depth of the water in her local creek. Her first nine measurements are below, in inches. .

$16\space15\space13\space12\space17\space 14\space11\space9\space 11$

1. What is the median of her data?

   Hint (a):

   The median is the middle number of an ordered set of data.

   Help (a):

   Order the measurements in ascending order, from least to greatest.

   More Help (a):

   From both ends, count until you get to a middle number. Remember, if there are two middle numbers, the median is the average of the two.

   Answer (a):

   $13$ inches.

2. Erika's next three measurements are $9$ inches, $10$ inches, and $9$ inches. What is the new median?

   Hint (b):

   See (a). Remember to include $9$, $10$, and $9$ inches in your new calculation.