This subject is related to Datawarehousing.

Please answer clear and concise.

a) There are three main measures of central tendency. (6 marks) Discuss each of them. b) Suppose that the data for analysis includes the attribute age. The age values for the data tuples are (in increasing order) 13,15,16,16,19,20,20,21,22,22,25,25,25,25,30,33,33,35,35, 35,35,36,40,45,46,52,70. i. What is the mean of the data? What is the median? ii. What is the mode of the data? Comment on the data's modality (i.e., bimodal, tri modal, etc.). iii. What is the midrange of the data? iv. Can you find (roughly) the first quartile (QI) and the third quartile (Q3) of the data? v. Give the five-number summary of the data. vi. Show a boxplot of the data