The heights of college students are normally distributed. If we measured 2,000 students how many would we expect to have heights that are within 1 standard deviation of the mean?
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While I know the answer (I teach statistics), I do not know whether your teacher wants you to use the approximation, the values from a table in the back of your textbook, values from an online calculator, values from Excel, or values from statistical software. Without such information, any answer I could give could possibly be incorrect.
You don't provide context, but your question certainly appears to be a question that your teacher either expects you to know or is assessing whether you know. Almost everyone here is involved in and values the education process. Asking us to answer this question will be taken by most of us as asking us to help you cheat, even if that is not your intent.
Every statistics book I've seen (granted I haven't seen all of them) has the answer to this in it. Not with 2000 college students, but the discussion of the normal distribution or model and how to tell what percentages lie within certain standard deviations. I encourage you to re-read the book and if you still have questions, to get help from your instructor.
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