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Theemployeespoke to an average of 10 customers every 30 minutes. The correct answer is option (b).The employee spoke with 800 customers in 40 hours, and we need to find theaveragenumber of customers every 30 minutes.Step 1: Find the total number of minutes worked in 40 hours.40 hours * 60 minutes/hour = 2400 minutesStep 2: Find the number of 30-minuteintervalsin 2400 minutes.2400 minutes / 30 minutes = 80 intervalsStep 3: Find the average number ofcustomersspoken to every 30 minutes.800 customers / 80 intervals = 10 customersSo, the employee spoke to an average of 10 customers every 30 minutes. The correct answer is option (b).learn more about "average":-brainly.com/question/130657#SPJ11...