Question: can you help me understand the method behind answering this Q5: The expected time to failure of a device of type-1 is 1.5 years, and,
can you help me understand the method behind answering this

Q5: The expected time to failure of a device of type-1 is 1.5 years, and, for type-2 devices, it is 2.1 years. Type-2 devices are 4 times most common than type-1 devices. If it is known that a particular device failed at some time between 1.4 and 1.6 years, what is the probability that it is a type-2 device
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