Almost all of the students' scores are below the average. Therefore, in this case the mean is not a good representative of the central tendency of this sample. The median, on the other hand, is the value which is such that half the scores are above it and half the scores below. So in this example, the median is 8. There are four scores below and four above the value 8. So 8 represents the mid point or the central tendency of the sample.
Definition of duct. 1 : a bodily tube or vessel especially when carrying the secretion of a gland. 2a : a pipe, tube, or channel that conveys a substanceb : a pipe or tubular runway for carrying an electric power line, telephone cables, or other conductors.
ductus deferens, vas deferens - a duct that carries spermatozoa from the epididymis to the ejaculatory duct. seminal duct - the efferent duct of the testis in man. ejaculatory duct - a part of the seminal duct formed by the duct from the seminal vesicle and the vas deferens; passes through the prostate gland.