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. Results are shown in the table below, but some values are missing. Fill in the missing values.
Social Media
Grade More Less Total
7th grade
15 27
8th grade
19
Total
68

Answer 1

Fill in the missing counts:

- 7th grade: Less = 15, Total = 27 → More = 27 − 15 = 12
- Grand total = 68, so 8th grade Total = 68 − 27 = 41
- 8th grade: Less = 19, Total = 41 → More = 41 − 19 = 22
- Column totals: More = 12 + 22 = 34; Less = 15 + 19 = 34

Completed table:
7th grade — More 12, Less 15, Total 27
8th grade — More 22, Less 19, Total 41
Total — More 34, Less 34, Total 68