What is the probability that a randomly chosen eight-week, Ask an Expert

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Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.

Let X = length, in seconds, of an eight-week old baby's smile.

What is the probability that a randomly chosen eight-week old baby smiles between 2 and 18 seconds?

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