The ultimate tensile strength of an aircraft bolt has mean 20 kN and is believed to be (at least approximately) normally distributed. The manufacturer wishes to control the quality of the aircraft bolt and measures the strength of 10 bolt samples. A sample standard deviation of 2 kN is observed, and it is assumed that the measurements are independent. Based on the information provided, for any ten randomly selected independent bolt samples, a) the sample mean will not be less than what value with 95% probability? b) what is the probability that the sample mean exceeds 18 kN (suppose that specifications for the aircraft bolt require that the ultimate tensile strength be at least 18 kN)?

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The ultimate tensile strength of an aircraft bolt has mean 20 kN and is believed to be (at least

approximately) normally distributed. The manufacturer wishes to control the quality of the

aircraft bolt and measures the strength of 10 bolt samples. A sample standard deviation of

2 kN is observed, and it is assumed that the measurements are independent. Based on the

information provided, for any ten randomly selected independent bolt samples,

a) the sample mean will not be less than what value with 95% probability?

b) what is the probability that the sample mean exceeds 18 kN (suppose that specifications

for the aircraft bolt require that the ultimate tensile strength be at least 18 kN)?

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