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1 Let X be the amount of time ( in years ) before a new light bulb stops working . Suppose X has probability density

1 Let X be the amount of time ( in years ) before a new light bulb stops working . Suppose X has probability density function f (t ) = / Ce- 0.4t t >o 0 otherwise , where C is a constant. a ) Find C. ( Hint : Pr ( - 00

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