Question

Write the lower-class limit of 20-30.

Answer 1

We first define the concept of the class. Then we discuss the limits they are made of. The differences between them are discussed. The relation between two classes is also considered. Thereafter we find the solution of the problem.

Complete step by step answer:
Here we have been given a class boundary of the frequency table. Now the starting value of the class is indicated as the lower-class limit.
The ending value of the class is denoted by upper-class limit.
The value of the lower-class limit is always lower than the upper-class limit.
Also, we need to remember that the upper-class limit of a class will be equal to the lower-class limit of the very next class.
We also need to remember that the distance or modulus difference between upper and lower-class limits is called the width of the frequency chart.
The lower-class limit of every class will be different.
In our given class of 20-30 the lower-class limit is 20.
The upper-class limit is 30.
The width of the class is $30-20=10$.
The lower-class limit of 20-30 is 20.

Note:
If the class is given in a frequency table then we need to recheck whether the class limit or the class-intervals are given. The endings of the classes are needed to be interconnected. Then we need to find the lower-class limit of the class.