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A rain gauge is a tube that collects rain for measuring. It is read every morning. Seven numbers, one week. This time the program does the counting.

This track is Data Handling I: Organizing & Visualizing Data.

What you will do

• A row of values. One list for the week. Count it.
• Reaching one of them. Positions start at 0.
• Building it up. A list the program fills as it runs.
• Adding them all up. One box, one line, one loop.
• The mean in code. Total divided by count.
• Biggest and smallest. One walk through the list. Nothing is put in order.
• Counting into groups. A tally, with a row for an empty group.
• Drawing it from the list. Bars from the program's own numbers.

Need a quick recap?

• Rows and columns — one record per row, one field per column.
• The tally — one mark per answer, one count per group.
• The mean — the total shared equally between the days, worked by hand.
• A value that comes back — a function with return at the end.