Use the image to answer the question.

Question

An illustration shows a number line with arrows on both ends ranging from 1 to 13 in one unit increments. Dots are plotted above the number line to indicate frequency. There is 1 dot over 2; 2 dots over 7; 4 dots over 8; 4 dots over 9; 3 dots over 10; 4 dots over 11; 3 dots over 12; and 2 dots over 13. There are no dots over the numbers 1, 3, 4, 5, and 6.

What number is the outlier in this dot plot?

Answer 1

In the dot plot you described, the frequency of the numbers is as follows:

• 2: 1 dot
• 7: 2 dots
• 8: 4 dots
• 9: 4 dots
• 10: 3 dots
• 11: 4 dots
• 12: 3 dots
• 13: 2 dots

The number 2 has only 1 dot, while all other numbers represented have either 2 or more dots. Because it is significantly less frequent than the other numbers, 2 is the outlier in this dot plot.