1.4.1 The lifetime, in years, of a certain class of light bulbs has an exponential distribution with...

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1.4.1 The lifetime, in years, of a certain class of light bulbs has an exponential distribution with parameter D 2. What is the probability that a bulb selected at random from this class will last more than 1.5 years? What is the probability that a bulb selected at random will last exactly 1.5 years?

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