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In 2013, the average monthly wage of all workers working in a business line is 1487 TL and their standard deviation is 65 TL

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In 2013, the average monthly wage of all workers working in a business line is 1487 TL and their standard deviation is 65 TL. The average wage to be calculated for a sample of 25 workers selected from among the workers;

a. Between 1497 and 1507

b. Between 1472 and 1502

c. Calculate the probability of being less than 1467.