In: Statistics and Probability
Note that the average for an exponential distribution is reciprocal of its parameter. Therefore the distribution here is given to be:
a) The probability that he will die after 900 hours is computed here as:
therefore 0.3247 is the required probability here.
b) Exponential distribution follows a memoryless property, therefore it does not matter whether it has worked for x numbers of hours, the probability that it will fail in the next 100 hours remain the same at any time point. It is computed as:
therefore 0.1175 is the required probability here.