in a certain region, the mean annual salary for electricians is $58,650. Let x be a random variable that represents an electrician's salary.  Assume the standard deviation is $1890.  If a random sample of 40 electricians is selected, what is the probability that the sample mean is less than $58,000?    A. 0.015   B. 0.365   C. 0.128   D. 0.319

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