Corrine had a baby one month ago. Since the birth, her moods have varied wildly between tearful to irritable. She has outbursts of sadness and crying and at other times feels out of control. She hears voices telling her that her baby should be returned to the heavens. Corrine is most likely suffering from

Measure of mean. When there are no outliers and the data seems symmetric then the mean and the standard deviation are used to measure the center and the spread. 

The only reason I believe it's be measure of mean is because even with the exact data, the only gap between the numbers would be a maximum of 10 and that still wouldn't be an outlier. Because of this, the mean would be the best measure of center since the data won't be skewed, only symmetric.