The life of light bulbs is distributed normally. The standard deviation of the lifetime is 20 hours and the mean lifetime of a b
ulb is 580 hours. Find the probability of a bulb lasting for at most 606 hours. Round your answer to four decimal places
1 answer:
Answer:
The probability of a bulb lasting for at most 606 hours is 0.9032
Step-by-step explanation:
The mean lifetime of a bulb is 580 hours.
The standard deviation of the lifetime is 20 hours
We are supposed to find the probability of a bulb lasting for at most 606 hours i.e.
Formula :
Z=1.3
Refer the z table
Hence the probability of a bulb lasting for at most 606 hours is 0.9032
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Step-by-step explanation:
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<span>1,2, 29,and 58 are the factors of 58.</span>
Answer:
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I hope it helps
Step-by-step explanation:
49 = -16t^2 + 56t
-16t^2 + 56t -49 = 0
(-4t +7) (4t -7) = 0
-4t+7 =0
t = 7/4