Question

a random sample of students were surveyed as to how much non - school screen time they had each week (for purposes of the survey, screen time was defined as: time spent online, on social media, watching tv, or playing video games) and if their grade average was above or below 80.
screen time

	above	below	total
4 - 8 hours	18	16	34
8 - 12 hours	12	14	26
more than 12 hours	10	12	22
total	47	49	96

what percent of the students who spend less than 4 hours a week on screens reported a grade average below 80? round your answer to the nearest tenth of a percent.
answer
%

Explanation:

Step1: Identify relevant counts

From the table, for "less than 4 hours" screen time: number of students with grade below 80 is 7, total students with "less than 4 hours" is 14.

Step2: Calculate percentage

Percentage = (Number of below 80 / Total for less than 4 hours) × 100 = ($\frac{7}{14}$) × 100 = 50.0%

Answer:

50.0%