The intensity of sound I (as a multiple of the average minimum threshold of hearing intensity) is related to the decibel level D (or loudness of sound) according to . Express using radical notation when . 
Definitions:
Absolute Value
Represents the distance of a number from zero on the number line, disregarding its direction (positive or negative).
Probability
A branch of mathematics that deals with calculating the likelihood of a given event's occurrence.
Sure Thing
A situation or outcome that is guaranteed to occur or a bet that is certain to win, often used in the context of investments or decisions with a predictable outcome.
Weighted Average
Weighted average is a calculation that takes into account the varying degrees of importance of the numbers in a data set, assigning weights to some of the numbers more than others.
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