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Test Scores and Normal Distribution

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Please refer to the attached question.

Suppose test scores are normally distributed.
What is the best choice for µ and σ ,
if the average score is 60 and 30% of the scores are over 73?

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The expert examines a test scores and normal distirbution

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3. Suppose test scores are normally distributed.
What is the best choice for µ and σ ,
if the average score is 60 and 30% of the scores are over 73? ...

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