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Probability based on Z score

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I need easy step by step instructions of how to do the following word problem.
A) A battery manufacturer advertises the average life of its automobile battery is 60 months.what % of batteries should last between 50 and 70 months? The standard deviation is 10 months.

B) If you purchased a battery and it lasted only 23 months, would the life of your battery be considered an outlier?

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Solution Summary

Step by step method for computing probability based on Z score is given in the answer.

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Business Stat I Practice Problem
A. I need easy step by step instructions of how to do the following word problem.
A battery manufacturer advertises the average life of its automobile battery is 60 ...

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