Interquartile range = middle 50%. Therefore you are speaking of mean (9) ± 3. What proportion are greater than 12 or less than 6?
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events. If the cubes are not weighted, previous results do not influence later results. 1/6 * 1/6 = ?
Mean ± 10 points = middle 50% (interquartile range). More data needed.
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What is mean and standard deviation? Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z scores. Multiply by 100.
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