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# Stats Problem: GRE Scores

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A graduate school program in Engineering will admit only students with GRE math proficiency score in the top 20. National GRE math scores are normally distributed with the mean of 547 and the standard deviation of 105. What is the lowest GRE score math they will accept?

##### Solution Summary

The solution provides a step-by-step working and a detailed explanation about how to calculate the lowest score that will be accepted by a graduate school using the normal distribution and standard deviation of GRE scores.

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1. A graduate school program in Engineering will admit only students with GRE math proficiency score in the top 20. National GRE math scores are normally distributed with the mean of 547 and the standard ...

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###### Education
• BSc , Wuhan Univ. China
• MA, Shandong Univ.
###### Recent Feedback
• "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
• "excellent work"
• "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
• "Thank you"
• "Thank you very much for your valuable time and assistance!"

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