(Answered) The usable lifetime of a particular electronic component is

Statistics

The usable lifetime of a particular electronic component is known to follow an exponential distribution with a mean of 6.2 years. Let X = the usable lifetime of a randomly selected component.

(a) The proportion of these components that have a usable lifetime between 5.9 and 8.1 years is .

(b) The probability that a randomly selected component will have a usable life more than 7.5 years is .

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