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) Responses
The average final grade is 7.2 if a student spent 10 hours on social media.
The average final grade is 27% if a student spent 10 hours on social media.
The average final grade is 92% if a student spent 10 hours on social media.
The average final grade is 99% if a student spent 10 hours on social media.
The correct answer is:
The average final grade is 21% if a student spent 10 hours on social media.
This is obtained by substituting x=10 into the equation y=–7.2x+98.9 and solving for y.
y = –7.2(10) + 98.9 = 92 - 7.2 = 84.8 ≈ 85 (rounded to the nearest whole number)