Specifications for an aircraft bolt require that the ultimate tensilestrength be at least 18 kN. It is known that 10% of the bolts havestrengths less than 18.3 kN and that 5% of the bolts have strengthsgreater than 19.76 kN. It is also known that the strengths ofthese bolts are normally distributed.a. Find the mean of the strengths. [Select]b. Find the standard deviation of the strengths.[Select]b. About what proportion of the bolts meet the strength specification?[Select]

Given Z value for 10%=-1.28 Z value for 5%=1.645

Answered: Specifications for an aircraft bolt…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A population has a mean u = 90 and a standard deviation o = 30. Find the mean and standard deviation of a sampling distribution of sample means with sample size n= 231. H = (Simplify your answer.)
A team of ten (10) construction workers who are working on a project are classified according to the skill levels, Classes A to D. The table below shows the number of workers in each of the four (4) classes and their respective hourly pay-rate. Pay-rate (Rands/hour) Number of workers Class A 80 Class B 60 Class C 55 Class D 50 4. Calculate the mean hourly pay-rate for the 10 workers. A. R24.50/hour B. R57/hour C. R57.50/hour D. R61.75/hour
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