Question: An electrical appliance has a life time that is normally distributed with a mean of 25 months and standard deviation of 5 months. What is

An electrical appliance has a life time that is normally distributed with a mean of 25 months and standard deviation of 5 months. What is the probability that the appliance works for at least 30 months? 0.1587 0.1056 0.8944 0.8413 None of the above

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