In the following phrase \" The probability of Iq scores of adults between 110 and 130 is 0.1596\" What does this 0.1596 mean? Solution It means that if you picked a random adult, there would be a 15.96% chance of him/her of having an IQ score between 110 -130. There is a 84.04% chance of their IQ being 0 - 109 or over 130..