P("\\bar x >12)"
Assuming that the sample size, population mean and standard deviation are known,
Z="\\frac {\\bar x - \\mu} {\\frac{ \\sigma} {\\sqrt n}}"
= "\\frac {12 - \\mu} {\\frac{ \\sigma} {\\sqrt n}}"
Read the value of "P(z>\\frac {12 - \\mu} {\\frac{ \\sigma} {\\sqrt n}} )" from z-table.
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