Read the Math Notes box in this lesson and use the information to complete the following problems.  

The daily high temperatures in degrees Fahrenheit for the last two weeks in Grand Forks, North Dakota were $7$, $1$, $-3$, $0$, $4$, $-1$, $2$, $5$, $7$, $7$, $3$, $-2$, $-4$, and $-5$.

1. Calculate the median temperature.

   Hint (a):

   Refer to the Math Notes box in this lesson.

   More Help (a):

   Order the data from least to greatest, then find the middle of the data set.

2. Find the first and third quartiles (Q1 and Q3).

   Hint (b):

   Now find the median of the lower and upper halves of the data set.

3. What is the interquartile range (IQR)?

   Hint (c):

   The IQR is calculated by subtracting the first quartile from the third quartile

   Answer (c):

   $\text{IQR}=7$