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A certain standardized​ test's math scores have a​ bell-shaped distribution with a mean of 520and a...

A certain standardized​ test's math scores have a​ bell-shaped distribution with a mean of 520and a standard deviation of 114

Complete parts​ (a) through​ (c).

​(a) What percentage of standardized test scores is between406 and 634​?

Math   Statistics-And-Probability   
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I havr completed only part a because parts b and c are not given in the question.

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