Practice Questions: Data mining v=AvA Given: X=70,=52,=10. By substituting the given values into the formula, we can determine the z-score. Answer: Using the z-score normalization method, the normalized score for a student who received a 70 on the exam is 2.3 . This means the student's score is 2.3 standard deviations above the mean. 9. You have a dataset of prices of items in a store. The highest price in the dataset is $985. Using normalization by decimal scaling, determine the normalized value for an item priced at $525. vi=10jvi, Answer: Given the highest price (max value) is $985,j is the number of digits in the max value, which is 3 in this case. Using normalization by decimal scaling, the normalized value for an item priced at $525 is 0.525