Frequency tables: how many observations?

Each row says how many times a value occurred. Add the counts to find the total number of observations.

1. A teacher asked each student how many books they read this month. Results: 0 books: 5 students; 1 book: 1 student; 2 books: 2 students; 3 books: 3 students. How many students are there in all?
2. A teacher asked each student how many books they read this month. Results: 1 book: 2 students; 2 books: 4 students; 3 books: 3 students; 4 books: 2 students. How many students are there in all?
3. A coach counted the goals scored in each game of a season. Results: 0 goals: 3 games; 1 goal: 5 games; 2 goals: 4 games; 3 goals: 1 game. How many games are there in all?
4. A teacher asked each student how many books they read this month. Results: 0 books: 2 students; 1 book: 1 student; 2 books: 5 students; 3 books: 3 students. How many students are there in all?
5. A teacher asked each student how many books they read this month. Results: 2 books: 8 students; 3 books: 5 students; 4 books: 5 students; 5 books: 4 students. How many students are there in all?
6. A teacher asked each student how many books they read this month. Results: 2 books: 1 student; 3 books: 6 students; 4 books: 3 students; 5 books: 5 students. How many students are there in all?
7. A survey asked each household how many phone chargers it owns. Results: 0 chargers: 6 households; 1 charger: 5 households; 2 chargers: 5 households; 3 chargers: 3 households. How many households are there in all?
8. A coach counted the goals scored in each game of a season. Results: 1 goal: 4 games; 2 goals: 5 games; 3 goals: 1 game; 4 goals: 4 games; 5 goals: 3 games. How many games are there in all?
9. A teacher asked each student how many books they read this month. Results: 2 books: 4 students; 3 books: 9 students; 4 books: 8 students; 5 books: 7 students; 6 books: 6 students; 7 books: 7 students. How many students are there in all?
10. A teacher asked each student how many books they read this month. Results: 2 books: 9 students; 3 books: 4 students; 4 books: 5 students; 5 books: 8 students; 6 books: 6 students. How many students are there in all?
11. A coach counted the goals scored in each game of a season. Results: 1 goal: 4 games; 2 goals: 6 games; 3 goals: 1 game; 4 goals: 4 games; 5 goals: 6 games; 6 goals: 2 games. How many games are there in all?
12. A teacher asked each student how many books they read this month. Results: 2 books: 4 students; 3 books: 3 students; 4 books: 5 students; 5 books: 9 students; 6 books: 7 students; 7 books: 1 student. How many students are there in all?
13. A teacher asked each student how many books they read this month. Results: 0 books: 5 students; 1 book: 3 students; 2 books: 13 students; 3 books: 7 students; 4 books: 1 student; 5 books: 4 students. How many students are there in all?
14. A survey asked each student how many pets they have. Results: 0 pets: 6 students; 1 pet: 19 students; 2 pets: 9 students; 3 pets: 13 students; 4 pets: 19 students. How many students are there in all?
15. A teacher asked each student how many books they read this month. Results: 0 books: 18 students; 1 book: 16 students; 2 books: 3 students; 3 books: 10 students; 4 books: 19 students. How many students are there in all?
16. A survey asked each household how many phone chargers it owns. Results: 1 charger: 7 households; 2 chargers: 3 households; 3 chargers: 8 households; 4 chargers: 2 households; 5 chargers: 6 households. How many households are there in all?
17. A survey asked each household how many phone chargers it owns. Results: 0 chargers: 39 households; 1 charger: 37 households; 2 chargers: 19 households; 3 chargers: 12 households; 4 chargers: 32 households; 5 chargers: 3 households. How many households are there in all?
18. A teacher asked each student how many books they read this month. Results: 1 book: 36 students; 2 books: 24 students; 3 books: 37 students; 4 books: 11 students; 5 books: 33 students; 6 books: 13 students. How many students are there in all?
19. A coach counted the goals scored in each game of a season. Results: 0 goals: 37 games; 1 goal: 11 games; 2 goals: 4 games; 3 goals: 3 games; 4 goals: 21 games; 5 goals: 18 games. How many games are there in all?
20. A survey asked each student how many pets they have. Results: 0 pets: 34 students; 1 pet: 26 students; 2 pets: 7 students; 3 pets: 26 students; 4 pets: 24 students; 5 pets: 28 students. How many students are there in all?