The shelf life (Unit: years) of a product G is an exponentially
random variable. Know the average shelf life of product G is 3
years and each product G is warranted for 1 year.
a. Randomly select a G product, calculate the probability this
product has a shelf life that exceeds the warranty period.
b. Buy more products from the M factory already used, calculate the
probability to use the product for another 10 years
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