The life-time in hours of a certain electrical equipment has the normal distribution with mean - 80 and standard deviation 16. (i) What is the probability that the equipmer lasts at least 100 hours? (ii) If the equipment has already lasted 88 hours, what is the conditional probability tha it will last at least another 12 hours ?

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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 the 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 ?
Transcribed Image Text:The life-time in hours of a certain electrical equipment has the normal distribution with mean - 80 and standard deviation 16. (i) What is the 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 ?
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