I what percent of these bolts will withstand a stress of 90, Basic Statistics

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I what percent of these bolts will withstand a stress of 90

Problem:

Mechanical measurements on supposedly identical objects usually vary. The variation often follows a Normal distribution. The stress required to break a type of bolt varies Normally with mean 75 kilopounds per square inch (ksi) and standard deviation 8.3 ksi.

Required:

(i) What percent of these bolts will withstand a stress of 90 ksi without breaking?

(ii) What range covers the middle 50% of breaking strengths for these bolts?

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Basic Statistics: I what percent of these bolts will withstand a stress of 90

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