{"id":"data2-pie-chart-percent-check","audience":"marketing","category":"data","track":"data","technique":"verification","level":"beginner","title":"Check the labels on a pie chart against the counts","free":false,"task":"A pie chart in the marketing deck labels four channels with percents, and you suspect they don't add up. Write exactly 4 plain-text lines, one per slice, in the form 'Email: Right - 90 / 200 = 45%' or 'Social: Wrong - 60 / 200 = 30%, chart says 35%'. Then a last line 'Chart total:' giving what the chart's labels add up to. Under 70 words.","materialLabel":"Chart labels and survey counts (attached to your prompt automatically)","material":"Deck slide 12: \"Where customers first heard about us\" (Fernhill Foods survey)\n\nChart labels (pie):\nEmail 45%\nSocial 35%\nSearch 15%\nEvents 10%\n\nSurvey counts (customers could pick only one channel):\nEmail: 90\nSocial: 60\nSearch: 30\nEvents: 20\nTotal respondents: 200\n\nNotes:\n- The deck is for the sales kickoff on Friday.\n- The percent labels were typed by hand from an older draft.\n- The pie slices themselves are drawn from the counts, so only the labels need fixing.\n- Round to whole percents.","rules":[{"type":"plainText"},{"type":"maxWords","max":70}],"mistakes":[{"title":"Not recomputing","why":"The AI says the chart 'looks reasonable' without dividing the counts.","fix":"Add: \"For each slice write count / 200 = X%.\"","checks":["r0"]},{"title":"Missing the wrong label","why":"The AI doesn't compare to what the chart says.","fix":"Add: \"If wrong, write 'chart says 35%'.\"","checks":["r1"]},{"title":"Skipping the total","why":"The AI never notes that the labels sum to 105%.","fix":"Add: \"Last line: Chart total: 45 + 35 + 15 + 10 = 105%.\"","checks":["r2"]},{"title":"Leaving the format to chance","why":"The AI picks its own length and layout unless told the exact shape.","fix":"Add: \"Plain text, no bold or headings.\"","checks":["plainText"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for a total word limit and it often lands over it.","fix":"Cap each part instead, for example \"each line under 15 words.\"","checks":["maxWords"]}],"promptHints":[{"label":"Shows the line shape","patterns":["right -","wrong -","/ ?200"]},{"label":"Names the slices","patterns":["email","social","search","events"]},{"label":"Asks for the total line","patterns":["chart total"]},{"label":"Asks for the comparison","patterns":["chart says"]},{"label":"Rules out extras","patterns":["no intro","nothing after"]}],"hint":"Checking a chart means recomputing each slice. Ask for the division and the total of the labels.","mission":"Is this pie chart right?","musts":["One line per slice","Division shown","Chart total line"],"rubricLabels":["The Email, Search and Events lines say Right with 90 / 200 = 45%, 30 / 200 = 15% and 20 / 200 = 10%","The Social line says Wrong with 60 / 200 = 30%, noting the chart says 35%","A last line starts 'Chart total:' and says the labels add up to 105% (45 + 35 + 15 + 10), and there are exactly 5 lines"]}