The number of words in the active vocabulary of children of a
particular age is normally...
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The number of words in the active vocabulary of children of aparticular age is normally distributed with a mean of 3000 and astandard deviation of 500.
Use the Normal Curve Table to determine the number of words achild needs to have in his/her vocabulary in order to beincluded
(a) among the top 5% of vocabulary scores
(b) among the top 20% of vocabulary scores
(c) among the bottom 10% of vocabulary scores
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Solution mean 3000standard deviation 500Using standard normal tablea PZ z 51
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