The class interval of the following classes is :
10-20, 20-30, 30-40, 40-50
Class Interval Definition
The class interval in statistics represents the range or width of each class in a frequency distribution. It is the difference between the upper and lower class limits.
Class Interval Calculation
To find the class interval for the given classes (10-20, 20-30, 30-40, 40-50), we calculate the difference between the upper and lower limits for any class.
- For the class 10-20:
- Upper Limit = 20
- Lower Limit = 10
- Class Interval = Upper Limit - Lower Limit
- $\text{Class Interval} = 20 - 10 = 10$
- For the class 20-30:
- Upper Limit = 30
- Lower Limit = 20
- Class Interval = Upper Limit - Lower Limit
- $\text{Class Interval} = 30 - 20 = 10$
Similarly, the class interval for 30-40 is $30 - 20 = 10$, and for 40-50 is $40 - 30 = 10$. All the classes share the same interval.
Therefore, the class interval for the given classes is 10.
Important Questions from Classification of Data
The class marks in a frequency table are given to be 5, 10, 15, 20, 25, 30, 35, 40, 45, 50. The class limits of the first five classes are
In a test in Mathematics, 20% of the students obtained “first class”. If the data are represented by a Pie-Chart, what is the central angle corresponding to “first class”?
The following table gives the monthly expenditure of two families:
Expenditure (in Rs.)
Items
Family A
Family B
Food
3,500
2,700
Clothing
500
800
Rent
1,500
1,000
Education
2,000
1,800
Miscellaneous
2,500
1,800
In constructing a pie diagram to the above data, the radii of the circles are to be chosen by which one of the following ratios?
In an examination, 40% of candidates got second class. When the data are represented by a pie chart, what is the angle corresponding to second class?
Following histogram shows certain frequency distribution against class intervals.
The approximated mean of this distribution is:
