In February 2025
Answer to Question #307704 in Statistics and Probability for Nicka
A manufacturer of light bulbs produces bulbs that last a mean of 950 hours with a standard deviation of 120hours .what is the probability that the mean lifetime of a random sample of 10 of these bulbs is less than 900 hours
"P(\\bar X<900)=P(Z<\\frac{900-950}{\\frac{120}{\\sqrt{10}}})=P(Z<-1.32)=0.0934."
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