The number to classes should be between S and IS. Power than 5 classes cause excessive summarization. More than IS classes leave too much detail.

Class Width Divide the range by the number Of classes for an approximate class width Round up to a convenient number So if the number of classes Approximate e Class Width is = 6, then Class Width 10 The midpoint of each class interval is called the class midpoint or the class mark.

Order nowClass Midpoint = class beginning point + =30+D class width The relative frequency is the proportion of the total frequency that is any given class interval in a truculence distribution. Relative Class Interval frequency Frequency 20-under 30 18 40-under SO asunder 70 50 T total 100 The cumulative frequency is a running total of frequencies through the classes of a frequency distribution. Cumulative Class Interdependency 40.

Under SO so-under 60 3 49 madder 80 Total Frequency 18 +624 11 + 2435 46 Class IntervalFrequencyMidpointFrequency Frequency 0. Ender 40 40_under 50 ;under 60 under 80 1. 00 The cumulative relative frequency is a running total of the relative truculence’s through the classes of a truculence distribution, RelativeCumulativeRelative Class Intergovernmentalurgencyurgencyurgency 6. 12 under SO .

22 . 92 3. 06 C=under 80 Histogram vertical bar chart of frequencies Frequency Polygon line graph transience’s Give line graph of cumulative frequencies Pie Chart proportional representation tort categories of a whole Class Interval