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Exercise 1 Suppose the life time X of a certain brand of light bulb before burning out is normally distributed with hours and hours. Convert

Exercise 1

Suppose the life time X of a certain brand of light bulb before burning out is normally distributed with hours and hours.

  1. Convert x = 1620 hours to a z-score and write a sentence interpreting it.

  1. Convert x = 1250 hours to a z-score and write a sentence interpreting it.

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