Idea 4of 22Builds onDecide the one message first
Count out of the whole group
How do you turn a count into a share of the group?
Today you'll discover
- how to find the total
- how to write a count over it
- what a relative frequency is
Think firstHow Room 12 gets to school
8 of Room 12's students walk. What fraction of the class walks?
Decide first, then press Next. Find the whole group before you write any fraction.
A table of how Room 12 gets to school: walk 8, bus 6, car 4, bike 2, with the walk row ringed. A total row adds up to 20. A fraction column fills in 8/20, 6/20, 4/20, 2/20. The last step shows Room 9's pets: dog 10, cat 8, fish 5, no pet 2.
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: 8 walkers out of 20 is 8/20.
Two steps
Add every count to get the total. Then write each count over that total.
- Count8
- Total20
- Share8/20
Easy to get wrongThe bottom number is the whole group, every student asked. Not the others, and not 100.
Key word
- relative frequency
- how often something happened compared with the whole group: a count over the total, like 8/20
Ready to use it?
- Find the total of a frequency table.
- Write each count as a fraction of the total.