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The average weekly earnings of the plumbers in a city is [Mu=$750] with a standard deviation of [s=$40]. Assume that we select a random sample of [n=64 plumbers], what is the probability that the sample mean [x] will be greater than $740 or greater than $755?
a. 0.0228
b. 0.1587
c. 0.3413
d. 0.4772
e. None of the above answers is correct.

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