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Let x bar be the mean of a random sample of  n = 36 currents (in milliamperes)...

  1. Let x bar be the mean of a random sample of  n = 36 currents (in milliamperes) in a strip of wire in which each measurement has a mean of 16 and a variance of 6. X bar has an approximate normal distribution, find P(12.5 < x bar < 15.6) .
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