SOLUTION: The length of time, L hours, that a phone will work before it needs charging is normally distributed with a mean of 100 hours and a standard deviation of 15 hours. Find the probabi

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Question 1173249: The length of time, L hours, that a phone will work before it needs charging is normally distributed with a mean of 100 hours and a standard deviation of 15 hours. Find the probability that a randomly selected phone will work greater than 127 hours before it needs charging.
Answer by ewatrrr(24785) About Me  (Show Source):
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2 hours, 30 minutes


Hi

Find the probability that a randomly selected phone will work 

greater than 127 hours before it needs charging.

Normal distribution

 μ = 100   σ = 15   

P(x > 127) = 1 - P(x ≤ 127) = normalcdf(-999,127,100,5)= 1 - .964 = .036

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