Required information Specifications for an aircraft bolt require that the ultimate tensile strength be at least 18 kN. I

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Required Information Specifications For An Aircraft Bolt Require That The Ultimate Tensile Strength Be At Least 18 Kn I 1 (35.12 KiB) Viewed 18 times

Required information Specifications for an aircraft bolt require that the ultimate tensile strength be at least 18 kN. It is known that 10% of the bolts have strengths less than 18 4 kN and that 5% of the bolts have strengths greater than 19.76 kN. It is also known that the strengths of these bolts are normally distributed. Find the mean and standard deviation of the strengths The mean of the strengths is The standard deviation of the strengths is How is this Found? Explanation Since 10% of the bolts have strengths less than 18.4 kN, the score of 18.4 is-210-128 Since 5% of the bolts have strengths greater than 19.76 kN, the 2-score of 1976 is 205 1645. Therefore, (18.4-o-128, and (1976-0-1645 Solving for and a yields = 18.9951 and o=0.4650