Breaking bolts. Mechanical measurements on supposedly identical objectsusually vary. The
Chapter 0, Problem 7.27(choose chapter or problem)
Breaking bolts. Mechanical measurements on supposedly identical objectsusually vary. The variation often follows a Normal distribution. The stressrequired to break a type of bolt varies Normally with mean 75 kilopounds persquare inch (ksi) and standard deviation 8.3 ksi.(a) What percent of these bolts will withstand a stress of 90 ksi withoutbreaking?(b) What range covers the middle 50% of breaking strengths for these bolts?Soap in the shower. From Rex Boggs in Australia comes an unusual data set: beforeshowering in the morning, he weighed the bar of soap in his shower stall. The weight goesdown as the soap is used. The data appear in Table 7.3 (weights in grams). Notice thatMr. Boggs forgot to weigh the soap on some days. Exercises 7.28 to 7.30 are based onthe soap data set.
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