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Assume that the average time of a prototype endovascular stent is 19 months, and that 60%...

Assume that the average time of a prototype endovascular stent is 19 months, and that 60% of stents lasts 17 to 24 months, and that their age follows normal distribution. 1) Determine the standard deviation of the distribution. 2)What’s the probability that a particular stent will last less than 1 year?

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