The probability this text has been entirely written by a human, AI or a mix of the two.

Determining the probability that a piece of text has been written entirely by a human, entirely by AI, or by a mix of the two involves considering a few factors, such as the content characteristics, writing style, coherence, and various linguistic features. Here are some detailed aspects to consider:

1. Content Analysis: Assess if the content shows complex reasoning, emotional nuance, and creativity that typically characterize human writing. AI tends to produce more formulaic and structured responses.

2. Linguistic Features: Evaluate the richness of vocabulary, grammar use, and stylistic variances. Human writers often display a distinct voice and spontaneity that can be hard for AI to replicate completely.

3. Consistency: Look for consistency in tone and structure. AI-generated texts can sometimes have abrupt shifts in style or logic that might not occur in human writing.

4. Context Awareness: Examine whether the text demonstrates an understanding of context or cultural references that would require human-like understanding.

5. Detection Tools: Utilize machine learning detection tools designed to analyze texts and predict their authorship based on known characteristics of human vs. AI-generated text.

In conclusion, while specific probabilities cannot be numerically quantified without a proper analysis of the text, by examining these factors, one can make an informed judgment about the likelihood of whether the text was written by a human, AI, or a combination of both.