(Step-by-Step) The life of a cell-phone battery is normally distributed with a mean life of 30 months and a standard deviation of 10 months. What is the probability
Question: (4pts) The life of a cell-phone battery is normally distributed with a mean life of 30 months and a standard deviation of 10 months.
- What is the probability that a randomly chosen cell-phone battery will die within the first 2 years?
- If 20 such batteries are taken at random, what is the probability that the average life of these 20 batteries will exceed two years?
Deliverable: Word Document 
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Definition of Random Variable - MathCracker.com