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, 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.(1 point)
To predict the average final grade percentage for a student who 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 to the nearest whole number, the predicted average final grade percentage for a student who spent 10 hours on social media is 27%.