Calculus/statistics

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Expert: - 7/13/2010


Question
Hi,
I'm not sure if I should be using a z score for this and if I did what would x be? Could you please help?
Thank you

On a national standardized test with a normal distribution of scores, a mean of 50 and a standard deviation of 3.2, a student's score is 1.2 standard deviations above the mean.  What is the student's score?

Answer
To have a score 1.2 standard deviations above the mean says to start with the mean, which is 50,
and then add 1.2 standard deviations to it.

Now 1.2 standard deviations is ... well, a standard deviation is 3.2, and 1.2 * 3.2 = 3.84.

The only thing left to do is to add 3.84 and 50, and that will give you the answer.

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