The probability of randomly selecting a person with an IQ below 104 is approximately 0.5948.

b. The percentage of the general population with IQ scores below 104 is the same as the probability we found in part a, but expressed as a percentage:

Percentage = 0.5948 * 100 59.48%

So, about 59.48% of the general population has IQ scores below 104.

c. To create a diagram, you would draw a normal distribution curve with a mean of 100 and a standard deviation of Then, you would shade the area under the curve to the left of the IQ value 104, representing the percentage of the population with IQ scores below 104. The shaded area would represent approximately 59.48% of the total area under the curve.