as c gets large, e^-ct decreases, meaning F approaches 1.
That is, as c grows, so does the fraction likely to fail.
Actually, of course, c does not actually affect the reliability. It just serves as a predictor of how many can be expected to fail.
For manufacturers of computer chips, it is important to consider the fraction F of chips that will fail after t years of service. This fraction can sometimes be approximated by the formula F = 1 − e−ct, where c is a positive constant. How does the value of c affect the reliability of a chip?
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