Unit 21 · Frequency Tables
Frequency Tables
Mathematics · Grade 7
What You Will Be Able To Do
✍️Build a frequency table from raw data, using tally marks
📦Design classes that do not overlap and do not leave gaps
➕Work out cumulative frequency and use it to answer questions
⚖️Say what a table shows you, and what it can never show you again
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You give up knowing which mark belonged to whom, and in exchange you can see the shape of the whole set.
Presenter notes: Open by reading out forty test marks as a list, slowly, and then asking the class what they learned from it. The honest answer is nothing, because nobody can hold forty numbers in mind at once. Then show the same forty marks as a table and ask again. That contrast is the entire justification for this unit and it takes about two minutes to demonstrate.