Answer:

Tally marks are the representation of the data in the form of vertical lines. We put one vertical line (|) for each of the four counts. A diagonal line (\) is put for the fifth count. These marks are tally marks.

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In mathematics, tally marks are a simple method used for counting and recording data. They are commonly used to represent frequencies or occurrences of items in a set.

Tally marks are typically depicted as vertical lines or strokes, grouped in sets of five. After every group of four marks, a diagonal slash is drawn across the four vertical lines to indicate a set of five.

For example, if you have a data set with the following numbers: 2, 3, 1, 4, and 5, you can represent them using tally marks like this:

```

II

III

I

IIII

IIIII

```

Each tally mark represents one occurrence of the corresponding number in the data set. Tally marks are useful for quickly visualizing and counting data when dealing with smaller numbers or discrete values.