Question

a survey asked a random sample of students if they estimated they spent more or less than an hour a day on social media.

· 17 eighth - graders estimated they spent less than an hour.
· 32 eighth - graders were surveyed.
· 40 total students estimated they spent more than an hour.
· 33 total students estimated they spent less than an hour.

fill in the missing values in the table below.

social media

	more	less	total
8th grade
total

Explanation:

Step1: Find 8th - grade students who spend more than an hour

We know 32 eighth - graders were surveyed and 17 spent less than an hour. So the number of 8th - grade students who spend more than an hour is $32 - 17=15$.

Step2: Find 7th - grade students who spend less than an hour

The total number of students who spend less than an hour is 33, and 17 of them are 8th - graders. So the number of 7th - grade students who spend less than an hour is $33 - 17 = 16$.

Step3: Find 7th - grade students who spend more than an hour

The total number of students who spend more than an hour is 40, and 15 of them are 8th - graders. So the number of 7th - grade students who spend more than an hour is $40 - 15=25$.

Step4: Find the total number of 7th - graders

The number of 7th - grade students who spend more than an hour is 25 and the number of 7th - grade students who spend less than an hour is 16. So the total number of 7th - graders is $25 + 16=41$.

Step5: Find the total number of students surveyed

The total number of students who spend more than an hour is 40 and the total number of students who spend less than an hour is 33. So the total number of students surveyed is $40+33 = 73$.

Answer:

Social Media	More	Less	Total
8th grade	15	17	32
Total	40	33	73