Eighty five percent of the bits used in deep rock marble drilling endure rock resistance and...

Eighty five percent of the bits used in deep rock marble drilling endure rock resistance and 95% survive after the exposure to drilling. 80% can be pressure treated to go for one shift or more of drilling and only 10% of those which are not can be used for one shift or more. a) Draw the reliability chart of these drill bits b) What is the likelihood that a bit would last one or more lap?

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Ally Wells answered 5 months ago

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