MATHS 1 Marks Question

The monthly pocket money of six friends is given below:
Rs. 45,Rs. 30, Rs. 40, Rs. 25, Rs. 45.

1. Highest pocket money = Rs. 50
2. Lowest pocket money = Rs. 25
3. Range = 50 - 25 = 25
4. The amounts of pocket money in an ascending order is: Rs. 25, Rs. 30, Rs. 40, Rs. 45, Rs. 45, Rs. 50.

5-5.01, 5.01-5.02, 5.02-5.03.
Here the class limits and true class limits are the same
Therefore class size = 5.01 - 5.0 = 0.01.

0-4, 5-9, 10-14
True class limits are 0.5-4.5, 4.5-9.5, 9.5-14.5
Therefore class size = 14.5 - 9.5 = 5

Frequency:
The number of observations corresponding to class is called its frequency.

0-0.25, 0.25-00.50, 0.50-0.75
Here the class limits and true class limits are the same
Therefore class size = 0.25 - 0 = 0.25

100-120, 120-140, 160-180
Here the class limits and true class limits are the same
Therefore class size = 120 - 100 = 20

Class limits:
Each class is bounded by two figures, called the class limits.The figures on the left side of the classes are called lower limits while figures on the right side are called upper limits.

10-19, 20-29, 30-39
True class limits 19.5-19.5, 19.5-29.5, 29.5-29.5
Class size = 39.5 - 29.5 = 10

Variate:
Any character that can vary from one individual to another is called variate.

Class-size:The difference between the true upper limit and lower limit is called the class size of that class size.

Class interval:In the data each group into which raw data is considered is called a class-interval.