Intelligence tests are designed to provide a normal distribution of IQ scores with a mean of 100 and a standard deviation of 15.
What IQ scores are at least 1 standard deviation above the mean?
What is the probability of a randomly selected person having IQ score between 129 and 130?
What is the probability of a randomly selected person having an IQ score below 94?
What is the probability of a randomly selected person having a score beween 74 and 109?