Question 377628
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Hi
(385-365)/(100/(sqrt 25)) = 20/20 = 1 Note: {{{100/sqrt(25) = 100/5 = 20}}}
Z table or NORMSDIST(1)= .8413
1 - .8413 = .1587 Or 15.87% is the probability that the sample mean concentration will be above 385 parts per million.