About Data Handling
Data handling refers to utilizing collected data to find meaningful results to be used in further work.
What is data, and how do you organize it?
Data is what you collect from users in numbers, words, symbols, etc., but the data you collect is in raw form or unorganized and needs to be organized to draw meaningful results.
While trying to use data to make sense of it, we use the following terms and processes:
- Pictograph - Using pictures to group data.
- Bar Graph - Using single graphs to visualize data.
- Double Bar Graph - You use this method to compare two types of data.
- Pie charts - Graphing the data in a pie chart to represent it efficiently.
- Grouped Frequency Distribution - You make a table of huge data to represent it efficiently.
- Histograms - Histograms are bar graphs made using grouped Frequency Distribution.
- Tally Marks - Another way to represent data using GFD
You also use methods like probability (chance of occurrence of an event) to use the data to predict events and their chances to happen in the real world. probability consists of methods and terms like:
- Equally Likely Outcomes
- Random Experiment
- Experiment and Outcomes
- Experimental Probability
- Probability of an Event
These are all used to raw group data and efficiently to infer proper conclusions.
Data Handling Sample Questions for Class 8
Question 1
The average age of a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average age becomes 15.5 years. The number of persons initially going for picnic is:
A. 5
B. 10
C. 20
D. 30
Question 2
The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is:
A. 45
B. 50
C. 51.4 approx
D. 54.6 approx
Question 3
In a school with 600 students, the average age of the boys is 12 years and that of the girls is 11 years. If the average age of the school is 11 years 9 months, then the number of girls in the school is:
A. 150
B. 250
C. 350
D. 450
Question 4
In an examination, a pupil's average marks were 63 per paper. If he had obtained 20 more marks for his Geography paper and 2 more marks for his History paper, his average per paper would have been 65. How many papers were there in the examination?
A. 8
B. 9
C. 10
D. 11
Question 5
The average age of 3 children in a family is 20% of the average age of the father and the eldest child. The total age of the mother and the youngest child is 39 years. If the father's age is 26 years, what is the age of second child?
A. 15 years
B. 18 years
C. 20 years
D. Cannot be determined