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1d. If the grades on a test has an average of 68 (SD = 12.5) how many standard deviations above the mean would you have

1d. If the grades on a test has an average of 68 (SD = 12.5) how many standard deviations above the mean would you have to be if you wanted to be in the top 20% of your class?

What actual mark would need to be in the top 20% of the class?

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