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
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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