A Dell laptop company produces hard discs whose life follows a normal distribution, with mean (120 + 18) months and standard deviation (25 + 18) months. If we choose a hard disc at random what is the probability that its lifetime will be a. Less than 90 months? b. More than 130 months? C. Between 70 and 100 months?

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3) A Dell laptop company produces hard discs whose life follows a normal distribution, with mean
(120 + 18) months and standard deviation (25 + 18) months. If we choose a hard disc at random
w
what is the probability that its lifetime will be
a. Less than 90 months?
b. More than 130 months?
с.
Between 70 and 100 months?
Transcribed Image Text:3) A Dell laptop company produces hard discs whose life follows a normal distribution, with mean (120 + 18) months and standard deviation (25 + 18) months. If we choose a hard disc at random w what is the probability that its lifetime will be a. Less than 90 months? b. More than 130 months? с. Between 70 and 100 months?
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