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, x, and the average final grade percentage, y, based on the hours. Using the equation of the trend line of the data, y=-7.2x+98.9, predict the average final grade percentage, to the nearest whole number, if a student spent 10 hours on social media.
To predict the average final grade percentage if a student spent 10 hours on social media, we can substitute x=10 into the equation y=-7.2x+98.9:
y = -7.2(10) + 98.9
y = -72 + 98.9
y = 26.9
Rounding 26.9 to the nearest whole number, the predicted average final grade percentage is 27.