Make a box-and-whisker plot of the data.

Average daily temperatures in Tucson, Arizona, in December:

67, 57, 52, 51, 64, 58, 67, 58, 55, 59, 66, 50, 57, 62, 58, 50, 58, 50, 60, 63

To create a box-and-whisker plot of the data, we first need to calculate the five-number summary: minimum, first quartile (Q1), median, third quartile (Q3), and maximum.

Data in ascending order:
50, 50, 50, 51, 52, 55, 57, 57, 58, 58, 58, 58, 59, 60, 62, 63, 64, 66, 67, 67

Minimum: 50
Q1: 55
Median: 58
Q3: 63
Maximum: 67

Now we can draw the box-and-whisker plot:

Minimum - Q1 - Median - Q3 - Maximum
|--------------|--------------|----------|------------|
50 - 55 - 58 - 63 - 67

Please note that in a box-and-whisker plot, the lower edge of the box represents Q1, the line inside the box represents the median, and the upper edge of the box represents Q3. The whiskers extend to the minimum and maximum values.