Average Annual Salary of a Cosmetologist. As of 2008 the median salary for a cosmetologist in the United States was $11.13, which includes tips and commission. The lower 10th percentile earned on average $7.47 hourly, while the upper 90th percentile earned a median salary of $20.41 hourly.verage Annual Salary of a Cosmetologist. As of 2008 the median salary for a cosmetologist in the United States was $11.13, which includes tips and commission. The lower 10th percentile earned on average $7.47 hourly, while the upper 90th percentile earned a median salary of $20.41 hourly.
The median is the ((n + 1)/2)th item, where n is the number of values. For example, for the list {1, 2, 5, 7, 8}, we have n = 5, so the median is the ((5 + 1)/2)th item.
Finding the median in sets of data with an odd and even number of values. The median is the value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. In simple terms, it may be thought of as the middle value of a data set. For example, in the data set {1, 3, 3, 6, 7, 8, 9}, the median is 6, the fourth number in the sample.