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A certain teacher has a 15 item test in which the mean and SD of the raw score (the score counting item as 1 point)

A certain teacher has a 15 item test in which the mean and SD of the raw score (the score counting item as 1 point) is 11.5 with an SD of 1.75. The teacher see the raw score nearly normally distrib and decides to put the items on a z-score scale. What is the mean and Std Dev on this new sc What percent of raw scores fall between 9.75 and 13.25

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