The lifetime of a lightbulb follows an exponential distribution with a mean of 1 (measured in years, where each year is composed of 365 days). Suppose that you have 1000 lightbulbs mounted on the ceiling of a huge room. Their lifetimes are independent and follow the distribution mentioned above. Only when at least 10 lightbulbs stop working do we call the technician to change them. Today, all the lightbulbs are working. Find the approximate probability that tomorrow we will have to call the tech
The lifetime of a lightbulb follows an exponential distribution with a me…
Dec 6, 2021
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the average lifetime of a light bulb is 3000 hours with a standard deviation of 696 hours a simple random sample of 36 bulbs is taken a what are the expected value standard deviation and sha 07397
the average lifetime of a light bulb is 3000 hours with a standard deviati…
Aug 15, 2022
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Answered: The average lifetime of a lightbulb is 10,000 hours. What units would the variance of the lifetime of bulbs have | bartleby
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The lifetime of lightbulbs is known to be normally distributed with μ=100  h and σ=8  h. What is the probability that a bulb picked at random will have a lifetime between 110 and 120 burning hours? We are asked here to find P(110<X<120), where X refers to time measured in hours of burning time. Given μ=100  h and σ=8  h, and letting X1=110  h and X2=120  h, we get z1=(X1-μ)/(σ)=(110-100)/(8)=1.25 and z2=(X2-μ)/(σ)=(120-100)/(8)=2.50 Thus we want the area (probability) between z1=1.25 and z
The lifetime of lightbulbs is known to be normally distributed with μ=…
Dec 14, 2023
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