Common Core: S-MD.1
Problem 25 of 45s12-025
A team scores goals in a game: 0, 1, 2, 3 or 4, with probabilities 0.20, 0.35, , 0.15 and 0.10. What is ?
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Solution walkthrough1:54
- A probability distribution lists every value of with its probability. Together they must add to .
- Add the known four: . So .
- means at least goals: , or . The value itself counts.
- The three outcomes cannot happen together, so add: .
- Check with the complement: .
- Traps: is only , leaves out , and is , the other side.