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2. The weekly earnings (in thousands of $) of the supervisors on duty in the glass...

2. The weekly earnings (in thousands of $) of the supervisors on duty in the glass industry are governed by a normal probability distribution with a mean of $ 1000 and a standard deviation of $ 100.

a.If there are 2,500 supervisors in the glass industry, how many of them earn between $ 850 and $ 980?

Math   Statistics-And-Probability   
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