assume scores are normally distributed

mean AT score 92.5, sd 11.25

1) what proportion has AT score between 69.5 and 103.75

2) People with AT score greater than 125 have impaired attention. what proportion can be described as having impaired attention?

3) 7.12% have moderate to severe impairment. what is cut-off score on AT scale for moderate impairment

4) in ref to (2), what proportion have severe impairment but not more than 3 sd from mean?