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OK. Sorry if this is a stupid question, I'm just a little rusty on my statistics.

I have the mean and standard deviation of a data set. The data is a normal with possibilities $\{1,2,3,4,5\}$ with $n \approx 40$.

I am looking to find what percentage of people answered 4 or 5.

How would I compute that number?

Thanks!

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    Do you know anything else? In particular, the distribution of the results? You can't actually answer that question without it...2011-12-12
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    @DavidZaslavsky Normal2011-12-12
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    @mixedmath it's normal. I'm sorry for not knowing correct terminology2011-12-12
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    @Nick: That's fine, but perhaps you can tell me more. What does it mean for a (discrete) set to have a normal distribution? How many people answered 3, for instance?2011-12-12
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    @nick what mixedmath is saying is that saying something is Normal implies that the data is continuous. Saying a discrete sample space is Normal has little meaning. Moreover, even if your data were continuous, saying they're normal without specifying the parameters (mean and SD) has even less meaning. Perhaps you could supply a bit more context? Where did this problem come from? How do you know the data are well approximated by a normal distribution? What are the parameters of that distribution?2011-12-12

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