A manufacturer of lightbulbs wants to produce bulbs that last about 700 hours but, of course, some bulbs burn out faster than others. Let F(t) be the fraction of the company's bulbs that burn out before thours. F(t) lies between 0 and 1. Let r(t) = F'(t). What is the value of r(t)dt ? Select the correct answer. O frit)dt = 1 0 O frit)dt 0 Ofr(t)dt = 700 The integral is divergent.

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