Everything you need is in what you wrote.
You do understand that "z" is the usual shorthand for "a standard score",
and that a standard score is the representation of a given raw score as
its deviation from the population mean in standard-deviation units?
The rest is merely a lookup in a table of the standard normal
distribution. (I find it to be somewhat less than 0.15%, though.)
-- DFB.
On Mon, 2 Apr 2001, Jan Sjogren wrote:
> SAT scores are approximately normal with mean 500 and a standard
> devotion 100. Scores of 800 or higher are reported as 800, so a
> perfect paper is not required to score 800 on the SAT. What percent
> of students who take the SAT score 800?
>
> The answer to this question shall be: SAT scores of 800+ correspond
> to z>3; this is 0.15%.
>
> Please help me understand this. I don't understand how I get that
> z>3??? and that it is 0.15%?
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Donald F. Burrill [EMAIL PROTECTED]
348 Hyde Hall, Plymouth State College, [EMAIL PROTECTED]
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