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Directions: Practice using the z-score formula with these seven questions and state what that means in a sentence. Tell if the value will be usual, unusual, or very unusual. 1. Scores on a history test have an average of 80 with a standard deviation of 6. What is the zscore for a student who earned a 75 on the test? 2. The weight of chocolate bars from a particular chocolate factory has a mean of 8 ounces with a standard deviation of 0.1 ounces. What is the zscore corresponding to a weight of 8.17 ounces? 3. Books in the library are found to have an average length of 350 pages with a standard deviation of 100 pages. What is the z-score corresponding to a book of length 80 pages? 4. The temperature is recorded at 60 airports in a region. The average temperature is 67 degrees Fahrenheit with a standard deviation of 5 degrees. What is the zscore for a temperature of 68 degrees? 5. A group of friends compares what they received while trick or treating. They find that the average number of pieces of candy received is 43, with a standard deviation of 2. What is the z-score corresponding to 20 pieces of candy? 6. The mean growth of the thickness of trees in a forest is found to be .5 cm/year with a standard deviation of .1 cm/year. What is the z-score corresponding to 1 crn/year? 7. A particular leg bone for dinosaur fossils has a mean length of 5 feet with a standard deviation of 3 inches. What is the zscore that corresponds to a length of 62 inches