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In a probability experiment, Craig rolled a six-sided die 55 times. The die landed on a number greater than three 31 times. What is the ratio of rolls greater than three to rolls less than or equal to three?
A. 31/24
31/55 times he rolled a number greater than 3. Either you roll a number > 3, or you roll a number ≤3. 55/55 - 31/55 = 24/55 times he rolled a number less than or equal to 3.
Now we want the ratio of 31/55 to 24/55. Mutliply each side by 55 and we get 31/24.
The answer is A because: rolls greater than three/rolls less than or equal to three rolls greater than three: 31 rolls less than or equal to three: 55-31 = 24 rolls greater than three/rolls less than or equal to three = 31/24
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