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Question 8 1/ 1 point 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. The decay rate is: 0.1666 0.6666 e 0.3333 0.5000 w Hide question 8 feedback 1/3 =.3333 Question 9 1/ 1 point Suppose that the longevity of a light bulb is exponential with a mean lifetime of eight years. Seventy percent of all light bulbs last at least how long? 0.1175 0.1859 ve 9.6318 0.3034 0.3682
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