Final answer:
The sample proportion of defective items is 0.21.
Step-by-step explanation:
The sample proportion of defective items can be calculated by dividing the number of defective items by the total number of items in the sample. In this case, there are 21 defective items out of a sample size of 100.
Sample Proportion of Defective Items (p) = Number of defective items / Total sample size = 21 / 100 = 0.21
Therefore, the sample proportion of defective items is 0.21.