Here is the problem:

The National Center for Educational Statistics report that in the year ending 2003 some 400,000 students took the Graduate Record Examination. For this set of examinees, the observed mean Quantitative Score was 560 with a Standard Deviation (SD) of 100.

Assuming the distribution is normal, determine:

1. The number of students below/above the mean score.

2. The number of students whose scores fall between 1SD below the mean and 1SD above the mean.

3. The number of students whose scores will be less than 2SD above the mean.

4. Percentile rank of student who scores 760 in the Quantitative exam.

5. What is the score for a student whose score in the Quantitative exam is 1SD above the mean. What is her score.

Please help!! What is the formula for determining these scores. This is my first Graduate Statistical course in almost 10 years. I would appreciate any help. I just need some direction.

Thank you,

latonya