SOLUTION: A manufacturer of light bulbs claims that its light bulbs have a mean life of 700 hours and a standard deviation of 122 hours. You purchased 147 of these bulbs and decided that you
Algebra ->
Probability-and-statistics
-> SOLUTION: A manufacturer of light bulbs claims that its light bulbs have a mean life of 700 hours and a standard deviation of 122 hours. You purchased 147 of these bulbs and decided that you
Log On
Question 875030: A manufacturer of light bulbs claims that its light bulbs have a mean life of 700 hours and a standard deviation of 122 hours. You purchased 147 of these bulbs and decided that you would purchase more if the mean life of your current sample exceeded 676 hours. What is the probability that you will not buy again from this manufacturer? Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website! mean life of 700 hours and a standard deviation of 122 hours
Trial 147
P(x > 676) z = -24/(122/sqrt(147)) -24/10.0624 = -2.3851
P(z > -2.3851) = .9915 0r 99.15%
What is the probability that you will not buy again from this manufacturer .0085 or .85%
