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Okay for mean the formula is:

Mean = Σx/n

where

example:

(It can be done with or without table)

Scores: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Let's get the mean.

x's = scores; n = 10

Mean = (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 +10)/10

Mean = 55/10 = 5.5

This one for the ungrouped data.

We also have for the grouped data.

where:

Mean = Σfx/n

where

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Formula is simply add all then divide by 2

example

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55

55/2 = 27.5

There is also a formula for grouped data when a table is considered.

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Mode can be unimodal (only one mode), bimodal (means two modes), multimodal (more than 2 modes), no mode (means no mode at all)

In our example above, we have no mode because none of the numbers matches neither one of each.

It's hard to create tables here, so i can't show you how grouped data works

But i hope it helps.