Where should I write the mean and variance? Why is there no space or box to specify the order of writing?

Can you show me with a screenshot how and where I should record the values?

Where should I write the mean and variance? Why is there no space or box to specify the order of writing?

Can you show me with a screenshot how and where I should record the values?

@Mohammad_Fallah

You jou just write your formula in the pointed cell and when you run the next cell it will do the calculation.

I found the lack of instructions in this notebook to be extremely confusing.