Dieticians claim that most adults do not intake enough dietary fiber from food (not supplements). For optimal health, adults should intake an average

Dieticians claim that most adults do not intake enough dietary fiber from food (not supplements). For optimal health, adults should intake an average of 28 grams of fiber from food per day. Below is the amount of dietary fiber from food consumed by twenty randomly selected adults. At the 5% significance level, can we conclude that the average amount of dietary fiber from food consumed per day is less than 28 grams?22, 23, 18, 15, 17, 14, 25, 20, 21, 29, 28, 14, 12, 15, 18, 13, 17, 21, 24, 19