Question

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

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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