### Home > MC2 > Chapter 4 > Lesson 4.2.2 > Problem4-41

4-41.

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?

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

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

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.

$13$ inches.

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

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

Use the eTool below to determine the median.
Click the link at right for the full version of the eTool: MC2 4-41 HW eTool