Frequency tables: how many observations?
Each row says how many times a value occurred. Add the counts to find the total number of observations.
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A survey asked each household how many phone chargers it owns. Results: 0 chargers: 1 household; 1 charger: 1 household; 2 chargers: 3 households; 3 chargers: 4 households. How many households are there in all?
Answer: 9
A teacher asked each student how many books they read this month. Results: 0 books: 3 students; 1 book: 2 students; 2 books: 5 students; 3 books: 4 students. How many students are there in all?
Answer: 14
A survey asked each family how many pets they have. Results: 2 pets: 3 families; 3 pets: 1 family; 4 pets: 4 families; 5 pets: 4 families. How many families are there in all?
Answer: 12
Tip: Each row says how many times a value occurred. Add the counts to find the total number of observations.
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