Consider a firm that decided to use a c-chart to help keep track of the number of telephone requests received daily for information on a given product. Over 30-day period, an average of 45 requests per day are received. What is the value of the centerline? Consider a firm that decided to use a c-chart to help keep track of the number of telephone requests received daily for information on a given product. Over a 30-day period, an average of 34 requests per day are received. What is a three-sigma upper control limit for c-chart? (Round off to two decimal places)