Thank you very much I also used a logarithmic scale base 10 for the frequency on the x axis as well as the gain because I forgot to mention that to you.So i just changed that myself. and ended up with thisEarlier I wrote:

You have a table of output voltages at various frequencies.

You are looking for the gain of the amplifier, so you need to know the input voltage.

The gain is then the output volts divided by the input volts.

The gain can then be converted to dB using dB = 20Log10(V/v).

You do not state the input voltage so I am going to make the assumption that it was 200mV (0.2 volts).

Here is my interpretation of your results:

View attachment 96626

Using this table I produced this graph:

View attachment 96627

That is not too bad is it?

JimB