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Compute an expected revenue value using the corrected probabilities

  • For FP&A and financial analysts
  • You practice Catching mistakes and made-up facts
  • Time about 5 minutes
  • Level Intermediate

About this exercise

You're giving the CFO a probability-weighted revenue view. Write a prompt for plain text with lines starting "Low:", "Base:", "High:", "Probability check:" and "Expected value:". Scenario lines show probability x revenue. The check line adds the probabilities and says whether they total 100%. Use the corrected Low probability. No advice and no view on which case is likeliest. Under 80 words. No bullets or numbering.

Common mistakes when you ask AI for this

  • Using the draft 30%. The AI uses 30% for Low and the check shows 105%. Try: Say: "Use the corrected Low probability of 25%."
  • Commenting on likelihood. The AI says Base is the likeliest case. Try: Add: "No comment on which case is likeliest."
  • Missing the check. The AI skips the probability check. Try: Add: "Probability check: add the three and say whether they total 100%."
  • Markdown extras. The AI adds bold labels, headings and a closing note. Try: Say: "Plain text, no bold. Output only the lines asked for."
  • Trusting the AI to count words. AI is bad at counting and runs past word limits. Try: Ask for fewer words than the real cap and keep each line short.

What a strong prompt includes

  • Names the five lines
  • Uses the correction
  • Asks for the check
  • Bans advice
  • Caps length

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