Posted by **Dora** on Tuesday, February 14, 2012 at 2:24pm.

A math professor notices that scores from a recent exam are normally distributed with a mean of 64 and a standard deviation of 5. Answer the following questions using integer values. The professor decides to grade on a curve. If he wants 0.15% of the students to get an A, what is the minimum score for that A?

Again, I would appreciate seeing how this was solved.

Thanks

- Statistics -
**mac brown**, Tuesday, February 14, 2012 at 4:12pm
Given estimates and specifications that the population standard deviations is 250, total precision is 100 and the researcher wishes to be 95% confident in the result, the require sample size is?

- Statistics -
**Dora**, Tuesday, February 14, 2012 at 5:01pm
It shows there has been a response to my question but I don't see one that in my opinion addresses my question.

- Statistics (Dora) -
**PsyDAG**, Wednesday, February 15, 2012 at 11:43am
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion and its corresponding Z score.

Z = (score-mean)/SD

Put values into the above equation to find the score.

- Statistics (mac brown) -
**PsyDAG**, Wednesday, February 15, 2012 at 11:46am
First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.

Second, I am not familiar with your term, "total precision." Try posting again with clearer terms.

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