5.3 Exercise 51

Use the following information to answer the next three exercises. The average lifetime of a certain new cell phone is three years. The manufacturer will replace any cell phone failing within two years of the date of purchase. The lifetime of these cell phones is known to follow an exponential distribution.

What is the median lifetime of these phones (in years)?

1. 0.1941
2. 1.3863
3. 2.0794
4. 5.5452