Question #1.
"95\\%CI=(\\bar x-1.96\\frac{\\sigma}{\\sqrt{n}},\\;\\bar x+1.96\\frac{\\sigma}{\\sqrt{n}})=\\\\\n=(7.5-1.96\\frac{3}{\\sqrt{400}},\\;7.5+1.96\\frac{3}{\\sqrt{400}})=(7.206, 7.794)."
We are 95% confident that the average time in jail for robbery lies between 7.206 years and 7.794 years.
Question #2.
a.92% of similarly constructed intervals would contain the population mean.
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