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Problem

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17 Nov 2021

Given information

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.

During the years , a total of  earthquakes of magnitude greater than  have occurred in Papua New Guinea. Assume that the time spent waiting between earthquakes is exponential.

Step-by-step explanation

Step 1.

Probability occurring for an earthquake for nest three months after six months can be written as and probability for earthquake not occurring for next three months after the six months is written as .

Required probability can be calculated by,

 

Therefore, the given probability is

.  

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