## Question

###### The usage time of a telephone belonging to a specific brand may be looked upon as a random variable having normal distribution with a mean of 20 years and a variance 4 years: What is the probability that a randomly selected telephone will be used between 15 and 18 years?

The usage time of a telephone belonging to a specific brand may be looked upon as a random variable having normal distribution with a mean of 20 years and a variance 4 years: What is the probability that a randomly selected telephone will be used between 15 and 18 years?

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