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250 students took the Pre-Health Math II Test #1 at Durham College. Bobby scored a grade at the 67th percentile. If the course average was

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250 students took the Pre-Health Math II Test #1 at Durham College. Bobby scored a grade at the 67th percentile. If the course average was 68 with a standard deviation of 6.8, determine the following: a. What z-score is associated with Bobby's grade?| b. What is Bobby's actual grade on the exam? c. What percentage of students received grades between 60 and 65? d. How many students in the class received a grade between 61.2 and 74.8

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