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An electrical firm manufactures a certain type of light bulb that has a mean light of 1,800 hours and a standard
deviation of 200 hours. Find the probability that a random sample of 100 bulbs will have an average life of not
more than 1775 hours and not less than 1760 hours.
Let P(Z<-2)=0.0228, P(Z<-1.25) = 0.1056.
A. 0.9772
B. 0.0828
C. 0.8944
D. 1
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E. None of the other choices is correct
