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The average lifetime of a certain new cell phone is 3.4 years. The manufacturer will replace any cell phone failing within three years of the

The average lifetime of a certain new cell phone is 3.4 years. The manufacturer will replace any cell phone failing within three years of the date of purchase. The lifetime of these cell phones is known to follow an exponential distribution. 68% of these phone last how long (in years)?

4.5686

3.8741

4.7862

2.0794

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