The lifetime X of a certain electronic component is an exponential random variable with a mean of 7 hours. Assuming 2 of these components operate independently in a device, the device operates if at least two components operate. Find the probability that the lifetime of any electronic component is at least 4 hours.[The answer should be a number rounded to five decimal places, don't use symbols such as %]Find the probability that the device operates for at least 4 hours.[The answer should be a nu

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