Given:
"\\overline{x}=78.2" , "\\mu= 77,""\\sigma= 6", n=109
formula:
"Z= \\frac{\\overline{x}-\\mu}{\\frac{\\sigma}{\\sqrt{n}}}"
solution:
"Z= \\frac{78.2-77}{\\frac{6}{\\sqrt{109}}}"
=1.2/0.575
=2.087
answer: value of Z= 2.087
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