official SAT Test No10 Section 4 (Best fit line - Regression Line - Estimation Line)

Questions 10 and 11 refer to the following information.
In a certain school district 36 high school students
were selected at random for a study on Internet
and line reading habits. During October* each
student reported the average amount of time, to the
nearest halt hour, spent reading offline on Saturdays
and the average amount of time* to the nearest halt
hour, spent using the Internet on Saturday s The
scatter plot above shows the times recorded by the
students. A line of best fit is also shown.
10) The line of best fit underestimates one student s :
reported average time spent using the internet on
Saturdays by more than 2 hours. For how many
hours did this student report reading offline?