your teacher surveyed the class to determine the number of hours that each student spent on social media. Your teacher created a table and scatterplot graph that displayed the number of hours and the average final grade based on the hours. The trend line (equation) for the data is y=−7.2x+98.9 . Interpret the y -intercept. What is the average grade if a student was on social media for 10 hours?(1 point)
The y-intercept of the trend line is the value of y when x=0. In this case, the y-intercept is 98.9.
Interpreting the y-intercept, it represents the predicted average final grade when a student spends zero hours on social media. In other words, it is the average grade for students who do not use social media at all.
If a student spends 10 hours on social media, we can use the trend line equation to predict their average final grade. Plugging in x=10 into the equation, we get:
y = -7.2(10) + 98.9
y = -72 + 98.9
y = 26.9
Therefore, the average grade if a student was on social media for 10 hours is predicted to be 26.9.