Betty's bite-size candies are packaged in bags. The number of candies per bag is normally distributed, with a mean of 50 candies
and a standard deviation of 3. At a quality control checkpoint, a sample of bags is checked, and 4 bags contain fewer than 47 candies. How many bags were probably taken as samples?
47 = 50 - 3 or: 47 = Mean - 1 Standard deviation For normal distribution it means that 4 bags represent 16 % of all samples. 4 bags ------ 16% x bags ------ 100 % --------------------------- 4 * 100 = x * 16 16 x = 400 x = 400 : 16 x = 25 Answer: 25 bags were probably taken as samples.
