5. + 1 points llowskyintroStat1 5.HI·091 My Notes Ask Your Teacher The average l

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5. + 1 points llowskyintroStat1 5.HI·091 My Notes Ask Your Teacher The average lifetime of a certain new cell phone is 3 years. The manufacturer will replace any cell phone failing within 2 years of the date of purchase. The lifetime of these cell phones is known to follow an exponential distribution. What is the decay rate? (Enter your answer as a fraction.) Additional Materials Section 51 My Notes AskYour Teacher + 1 points llowskyntrostat 1 5.HI·060 The Sky Train from the terminal to the rental car and long-term parking center is supposed to arrive every 16 minutes. The waiting times for the train are known to follow a uniform distribution. Find the 70th percentile for the waiting times (in minutes). min Additional Materials Section 51

Explanation / Answer

5.

Mean of exponential distribution is 3 years.

Decay rate = 1 / mean = 1/3

6.

Mean of unifirm distribution = 16 min.

70th percentile of unitform distribution = 0.7 * 16 = 11.2 min

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