z=\frac{\left(x-\mu\right)}{\frac{\sigma}{\sqrt{n}}}
Z: critical value
\sigma\colon : population standard deviation.
n: sample size
\mu\colon population mean
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Math question: In a circle with center O, if angle ABC is 80°, what is the measure of angle ADC?
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What is the value of f(x) when x = 4 in the reciprocal/rational function f(x) = 1/x? (