A quality control team is monitoring the proportion of defective products produced by a manufacturing process. They collect data in the form of samples, with each sample consisting of 100 items. The team has collected data for five consecutive samples, and the number of defective items in each sample is as follows:

Sample 1: 1 defective items Sample 2: 8 defective items Sample 3: 7 defective items Sample 4: 7 defective items Sample 5: 10 defective items

Using this data calculate the UCL of a p-chart. Please keep at least TWO decimals.