Problem-Solving and Data AnalysisMediumProbability after one sweet is removed
Problem-Solving and Data Analysis practice question
A jar holds 20 sweets: 8 red, 7 green, and 5 yellow. One red sweet is taken out and eaten. If one of the remaining sweets is drawn at random, what is the probability that it is red?
Answer: 7/19
7 red sweets remain among 19, so the probability is 7/19.
Common wrong answers
- If you answered 8/20
- 8/20 ignores the sweet that was eaten.
- If you answered 7/20
- 7/20 reduces the reds but not the total.
- If you answered 8/19
- 8/19 reduces the total but not the reds.
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