Data Handling class 7.pptx

data handling

1. Data Handling Class 7 Prepared By : Sharda Chauhan

2. Data : Data is the collection of informations collected for definite purpose . Ex: Collection of marks of students of class 7out of 40 in Mathematics. Heights of students of class 7. Weights of students f class 7

3. WHAT IS DATA HANDLING? Data handling is the way in which Data can be represented graphically to give a clear idea of what it represents. It is easier to interpret and organize data using pictorial representation. Data handling includes bar graph, pictograph and tallymarks .

4. WHAT IS A BAR GRAPH? It is the way of representing data visually. Bars are of uniform width and can be drawn horizontally or vertically with equal spacing between them. The length of each bar represents the given number frequency.

5. WHAT IS A PIE CHART ? • These are called circle graphs. A circle graph shows the relationship between a whole and its parts. Here, the whole circle is divided into sectors. The size of each sector is proportional to the activity or information it represents.

6. WHAT IS A PICTOGRAPH? The representation of an information through pictures is called a pictograph. Pictographs use relative sizes or repetitions of the same icon, picture, or symbol to show comparison. Also called pictogram, pictorial chart, pictorial graph, or picture graph.

7. WHAT IS TELEGRAPH? A method of counting frequencies, according to some classification, in a set of data. For ease of counting, every fifth observation is represented by a diagonal line crossing the previous four to make a five-barred gate. Tally charts are often used with grouped observations.

8. TYPES OF BAR GRAPH Stacked Bar Graph Double Bar Graph Horizontal Bar Graph Vertical Bar Graph

9. RANGE Range = Highest value – lowest value Range is another representative value of the data. Range is defined as the difference between the highest and the lowest observation.

10. MEAN Mean= Sum of observations/Number of observations Mean is the most common representative value of a data. It values between the maximum and minimum observation of a data.

11. Questions for students . Find the mean of first 10 whole numbers. Find th mean of runs scored by a batsman in 6 innings 36,35,50,46,60,65

12. MEDIAN Median=Middle of the data Median refers to the value which lies in the middle of the data when data is arranged in an increasing or decreasing order.

13. Formula for finding the median after arranging the data in ascending order. When the number of observations are odd then median term is where n is the number of observations. Find the median of the following observations 6,15,120,50,100,80,10,15,8,10,15 Ascending order 6,8,10,10,15, 15 ,15,50,80,100,120 Median term is = = =6 Hence 6observtion ie15 is median  

14. MODE Mode=Number came most Mode is another form of central tendency or representative value. The mode of a set of observations is the observation that occurs most often.

15. Any Questions?

16. Thankyou!