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Answer to Question #129809 in Statistics and Probability for KHANSA
Question #129809
The mean and standard deviation for the life time of a population of light bulbs are
1200 and 50 hours respectively. Assuming these lifetimes are normally distributed,
what is the probability that a light bulb will last over 1500 hours?
1200 and 50 hours respectively. Assuming these lifetimes are normally distributed,
what is the probability that a light bulb will last over 1500 hours?
Expert's answer
"P(X>1500)=P(Z>\\frac{1500-1200}{50})=P(Z>6)=1-P(Z<6)="
"=1-1=0."
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