Solution to The lifetime of bulbs produced by Tariqs lightening company follows a normal distribution with a … - Sikademy
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The lifetime of bulbs produced by Tariqs lightening company follows a normal distribution with a mean of 3462 hours and a standard deviation 1070 hours. What is the probability that randomly selected bulb will have a lifetime of at most 2800?

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What is the probability that a randomly chosen light bulb will have a lifetime of at most 2800 hours?

μ = 3462 \; hours \\ σ = 1070\;hours \\ P(X<2800) \\ = P(Z< \frac{2800-3462}{1070} )\\ = P(Z<-0.6187) \\ =0.26806 \\

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