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Answer the question(s) based on the following situation: 150 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with center ì = 65 and standard deviation ó = 10.The third quartile of the scores on the exam is approximately

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    Z = (x - mean)/standard deviation

    In a table labeled something like "areas under normal distribution," look for Z score at 75th percentile (third quartile). Insert values into the above equation and solve.

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