Idea 19of 22Builds onAs a fraction, a decimal or a percent
The parts make 100%
What do all the relative frequencies add up to?
Today you'll discover
- what the percents add to
- what the decimals add to
- how to find a missing part
Think firstPopcorn's row is hidden
Fruit 40%, granola 30%, crackers 20%. What percent chose popcorn?
Decide first, then press Next. Look at the total row first.
A relative-frequency table for “Which snack do you like best?”, 50 students: fruit 40%, granola 30%, crackers 20%, and the popcorn row hidden. Then popcorn is shown: 5, 5/50, 0.10, 10%, and the total row reads 50, 50/50, 1 and 100%. The last step hides the bike row of the travel table.
See the whole ideathe big idea and the key word, in one place
The big idea
In a relative-frequency table, the parts always add to 1, or 100%.
Snacks, 50 asked
Fruit 40%, granola 30%, crackers 20%, popcorn 10%: 100% in all.
Easy to get wrongIf your percents add to 98% or 103%, look for a counting slip or a rounded number before you trust the table.
Key word
- relative-frequency table
- a frequency table with columns for each count out of the total, as a fraction, decimal or percent
Ready to use it?
- Complete a relative-frequency table.
- Find a missing relative frequency from the others.