Question 17: Suppose that an object has lifetime obeys an exponential distribution with 2=2 per year. Let assume that T denotes the life of this object (or the time to failure) of this component. a) Give the probability density function (here, it is a failure probability density function), and probability distribution (Cumulative probability distribution function) of its length of life T. b) What is its expected lifetime (mean time to failure, MTTF)? c) What is the probability that it will not fail within the first year? P(T > 1) =?
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
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