Gold’s Gym selected a random sample of 10 customers and monitored the number of times each customer used the workout facility in a one-month period. The following data were collected:
10 19 17 19 12 20 20 15 16 13
Gold’s managers are considering a promotion in which they reward frequent users with a small gift. They have decided that they will only give gifts to those customers whose number of visits in a one-month period is 1 standard deviation above the mean. Find the minimum number of visits required to receive a gift.