A data set can have more than one mode

Yes! Look at the explanation below:

Step-by-step explanation:

When a data set have 2 mode, it is called a bimodal.

If the data set have more than 2 modes, it is called multimodal.

I will give you an example:

10, 34, 34, 56, 56, 78

In this case there are two modes, which is correct.

Sometimes, if all the data is the same number:

34,34,34,34,34,34

Then it has no mode.

To conclude, a data set can have more than one mode.