The test question is: IQ scores on the WAIS test approximate a normal curve with a mean of 100 and a

standard deviation of 15. What IQ score is identified with the upper 2 percent, that is, 2 percent to the right (and 98 percent to the left)?

I know the formula would be x-100 divided by 15 equals the z score. However, I do not know how to calculate it with a percentage, only with a number. How do I find it as a 2%