Scores on the Wechsler Adult Intelligence Scale (WAIS) approximate a normal curve with a mean of 100

Question:

Scores on the Wechsler Adult Intelligence Scale (WAIS) approximate a normal curve with a mean of 100 and a standard deviation of 15. What proportion of IQ scores are
(a) Above Kristen’s 125?
(b) Below 82?
(c) Within 9 points of the mean?
(d) More than 40 points from the mean?