Chloe surveyed students in her class about the numbers of text messages they sent and received the previous day. An approximate least-squares regression line was used to predict the number of text
messages received from a given number of text messages sent.
80+
70-
60+
50+
Text messages received
40-
30
20+
10+
10 20 30 40 50 60 70 80
Text messages sent
Interpret the residual for the student indicated in the scatterplot above.