The life-time in hours of a certain electrical equipment has the normal distribution with mean= 80 and standard deviation = 16. (i) What is probability that the equipment lasts at least 100 hours? (ii) If the equipment has already lasted 88 hours, what is the conditional probability that it will last at least another 12 hours? For solving this question, you can use the 'normal area curve table'.
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The life-time in hours of a certain electrical equipment has the normal distribution with mean= 80 and standard deviation = 16. (i) What is probability that the equipment lasts at least 100 hours? (ii) If the equipment has already lasted 88 hours, what is the conditional probability that it will last at least another 12 hours? For solving this question, you can use the 'normal area curve table'.
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