A rolling average is a range of the average out of a whole range that fluctuates dependent upon various factors.
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The answer depends on what "rolling a one" refers to.rolling a sum of one,rolling a difference of one,rolling a product of one,rolling a one on one die only,rolling a one on one or both dice.Unfortunately these probabilities are different and the question is ambiguous.
stops rolling?
If rolling 1 die it is 1; if rolling 7 dice it is 0.
Prob(Rolling 2 when rolling 1200 times) = 1 - Prob(not rolling 2 when rolling 1200 times) = 1 - (5/6)1200 = 1 [accurate to 95 decimal places] That is, it is virtually a certainty.
She obtained the average speed of the three measurements.