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1.What percentage of standardized test scores is between405 and 625 if A certain standardized​ test's math...

1.What percentage of standardized test scores is between405 and 625 if
A certain standardized​ test's math scores have a​ bell-shaped distribution with a mean of 515 and standard deviation of 110 complete parts a

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Answer #1

Solution :

Given that ,

mean = = 515

standard deviation = = 110

Using Empirical rule,

a) P( - < x <   + ) = 68%

= P( 515 - 110 < x < 515 + 110 ) = 68%

= P( 405 < x < 625 ) =68%

The percentage is = 68%

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