CH-13 STATISTICS

2. – A graph obtained by joining the class marks of a frequency distribution with straight lines is called a frequency polygon.
3. – A graph representing cumulative frequency is called an ogive.
5. – The running total of frequencies is called cumulative frequency.
6. – Data listed without class intervals is called ungrouped data.
7. – The midpoint of a class interval is called the class mark.
8. – The number of times a value occurs in a data set is called its frequency.
10. – The median is the middle value of an ordered data set.
11. – The mode is the value that occurs most frequently in a data set.
13. – Data arranged into class intervals is called grouped data.
15. – Statistics is the branch of mathematics that deals with the collection, organization, analysis, and interpretation of data.

1. – Each individual value in a data set is called an observation.
4. – A table showing the frequencies of different values or class intervals is called a frequency distribution.
5. – The range of values grouped together in a frequency distribution is called a class interval.
9. – The difference between the highest and the lowest value in a data set is called the range.
12. – The mean is the average value of a set of observations.
14. – A collection of facts or figures is called data.