Let it be stated that the standard usage of the battery of a kind of pos device shows an exponantial distribution with an average life span of five years. What is the probability that a user who uses the Pos device for three years without battery problem will deal with the battery problem in the next year? a. None of them b. 0.819 c. 0.20 d. 0.281 e. 0.091

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Let it be stated that the standard usage of the battery of a kind of pos device shows an exponantial distribution with an average life span of five years. What is the probability that a user who uses the Pos device for three years without battery problem will deal with the battery problem in the next year?

a. None of them

b. 0.819

c. 0.20

d. 0.281

e. 0.091

 

note : i do not need the step by step solution. I just need answer. I have limited time. I will be thankfull if answer is too quick. thx.

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