Question

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)

The average final grade is 27% 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 average final grade is 7.2 if a student spent 10 hours on social media.

The average final grade is 92% if a student spent 10 hours on social media.

Answer 1

y = −7.2(10) + 98.9 = −72 + 98.9 = 26.9 ≈ 27%

So the average final grade is 27% if a student spent 10 hours on social media.