Statistics and operations research ppt
- 1. Statistics And Operations Research G.Nagalashmi M.Sc.,M.Phil. M.Mohana Malar M.Sc.M.Phil.
- 2. Mean, Median and Mode are three kinds of averages. There are many averages in statistics. The mean is the average you are used to where you add up all the numbers and then divide by the number of numbers.
- 3. The median is the middle value in the list of numbers. To find the median your numbers have to be listed in numerical order from smallest to largest, so you may have to rewrite your list before you can find the median.
- 4. The mode is the value that occurs most often. If no number in the list is repeated, then there is no mode for the list.
- 5. Mean of Grouped Data 𝑥 = 𝑓𝑥 𝑛 where 𝑥 = mean 𝑓 =frequency of each class 𝑥= mid interval value of each class 𝑛=total frequency
- 6. Weighted mean Weighted mean= (𝑥 𝑖 𝑤𝑖) 𝑤𝑖 where 𝑖 = 1,2,3 … . 𝑛
- 7. Standard deviation A quantity expressing by how much the members of a group differ from the mean value for the group
- 8. In Statistics and probability theory standard deviation shows how much variation or dispersion exists from the average. Use of standard variance when comparing data sets to determine which is more variable.
- 9. It used to determine the consistency of a variable. To determine the number of data values that fall within a specified interval in a distribution. Used quite often in inferential statistics.
- 10. Thank You