Idea 17of 22Builds onTally, then count
How many out of how many
How do you show a count as part of everyone asked?
Today you'll discover
- how to write a count over the total
- which number goes on the bottom
- what the fractions add to
Think first8 of the 20 chose a dog
8 of the 20 students chose a dog. Which fraction shows that?
Decide first, then press Next. Find the total row before you write any fraction.
The pet table: dog 8, cat 6, fish 4, bird 2, total 20. A fraction column slides in: 8/20, 6/20, 4/20, 2/20, and 20/20 on the total row. The last step shows the travel table: bus 10, walk 8, car 5, bike 2, total 25.
See the whole ideathe big idea and the key word, in one place
The big idea
A relative frequency is a count out of the total: how many out of how many.
The pet table
Dog 8/20, cat 6/20, fish 4/20, bird 2/20. Every one is over 20, the number asked.
dog8/20cat6/20fish4/20bird2/20
Easy to get wrongThe bottom number is everyone asked, not the people who chose something else. 8 dogs out of 20 is 8/20, not 8/12.
Key word
- relative frequency
- a count out of the total, like 8 out of 20, written as a fraction, decimal or percent
Ready to use it?
- Write a relative frequency as a fraction of the total.