Describe the probable shape - normal, bimodal, positively skewed, or negatively skewed - for each of the following distributions. Scores on a standardized IQ test for a group of people selected from the general population normal Test scores for a group of high school students on a very easy math test bimodal negatively-skewed Reading achievement scores for a third grade class consisting of about equal numbers of positively-skewed sing- challenged students Uninterrupted gestation periods of human fetuses