Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 P(A) = 1/4. Find P(not A). (as a fraction)
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3/4.
2 P(heads) = 1/2. Find P(tails). (as a fraction)
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1/2.
3 What is the complement of "drawing a red card" from a deck?
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Drawing a black card.
Level 2 · Core
4 P(rolling a 6) = 1/6. Find P(not a 6).
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5/6.
5 P(rain) = 0.3. Find P(no rain). (as a decimal)
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0.7.
6 P(not winning) = 7/10. Find P(winning). (as a fraction)
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3/10.
Level 3 · Challenge
7 Two coins are tossed. Find P(at least one head). (as a fraction)
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1 − 1/4 = 3/4.
8 Two dice are rolled. P(total is 7) = 1/6. Find P(total is NOT 7).
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1 − 1/6 = 5/6.
9 What is the complement of "scores 5 or more"?
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Scores 4 or fewer. The 5 belongs to the original event.