Is it necessary to transcribe computer screenshots (e.g., Excel worksheets, etc.)? See attached .pdf (my apologies for the quality... the copy of the textbook I received has some badly printed sections).
For the specific examples you attached, I would perhaps just include the parts referenced in the instructions: the frequency distribution and the bar chart. They would not have to be transcribed in Computer Braille Code. It's hard to answer questions like this when I don't have the whole book to look at.