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	11	10	21
8 - 12 hours	14	12	26
more than 12 hours	15	20	35
total	46	48	94

what percent of the students who spend 4 - 8 hours a week on screens reported a grade average above 80? round your answer to the nearest whole number percent.
answer attempt 1 out of 2
%

Explanation:

Step1: Identify relevant values

The number of students who spend 4 - 8 hours on screens and have grade average above 80 is 11, and the total number of students who spend 4 - 8 hours on screens is 21.

Step2: Calculate the percentage

The percentage formula is $\frac{\text{Number of favorable cases}}{\text{Total number of cases}}\times100\%$. So we have $\frac{11}{21}\times 100\%$.
$\frac{11}{21}\times100\%=\frac{1100}{21}\% \approx 52.38\%$.

Step3: Round to the nearest whole number

Rounding 52.38% to the nearest whole - number gives 52%.

Answer:

52%