see below: Assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard deviation 20. Find P3. which is the IQ score separating the bottom 3% from the top 97%. The IQ score that separates the bottom 3% from the top 97% is P3 = (Round to the nearest hundredth as needed.) Solution the IQ score that separates the bottom 3% from top97% is 67.8.