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## Basic Statistics Presentation

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**Introduction to Statistics**Md. MortuzaAhmmed**MEASURES OF CENTRAL TENDENCY**A measure of central tendency is a single value that attempts to describe a set of data by identifying the central position within that set of data. • Arithmetic mean (AM) • Geometric mean (GM) • Harmonic mean (HM) • Median • Mode**Arithmetic mean**It is equal to the sum of all the values in the data set divided by the number of values in the data set.**Problems**• Find the average of the values 5, 9, 12, 4, 5, 14, 19, 16, 3, 5, 7. • The mean weight of three dogs is 38 pounds. One of the dogs weighs 46 pounds. The other two dogs, Eddie and Tommy, have the same weight. Find Tommy’s weight. • On her first 5 math tests, Zany received scores 72, 86, 92, 63, and 77. What test score she must earn on her sixth test so that her average for all 6 tests will be 80?**mean, median and mode for series data**For a series 1, 2, 3 ….n, mean = median = mode = (n + 1) / 2 So, for a series 1, 2, 3 ….100, mean = median = mode = (100 + 1) / 2 = 50.5

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