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Normally distributed with a a mean

A brake assembly has been tested and found to have a capacity that is normally distributed with a a mean of 275 lb and a stadard deviation of 25lb. If a normally distributed force having a mean of 180lb and standard deviation of 30 lb is applied, what is the static reliability? As the variability ( variance) of either the strength or load increases, what happens to the the reliability?

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## Q : Determine mean of the sample mean

A population has mean 20. A simple random sample of size 100 is selected from this population. What is the mean of the sample mean?