Classification of Data and Types of Classification

Identify the midpoint of the class interval if the lower limit and the upper limit of a class are $21$ and $25$ respectively,

Identify the midpoint of the class interval if the lower limit and the upper limit of a class are $35$ and $39$ respectively,

Identify the midpoint of the class interval if the lower limit and the upper limit of a class are $25$ and $29$ respectively,

The class interval of the type 5-9, 10-14, 15-19, 20-24, 25-29, 30-34 represents

Which of the following is the process of arranging the data in groups of related facts in different classes?

A shopkeeper takes $12$ bags of coins to the bank. The bags contain the following numbers of coins:
$150, 163, 158, 165, 172, 152, 160, 170, 156, 162, 159$ and $175$
Each bag contains coins of the same value, and the shopkeeper has at least one bag containing coins with dollar values of $0.10, 0.25, 0.50$ and $1.00$ only.
What is the greatest possible value(in dollar)  of all the coins in the $12$ bags?

The method of classifying statistical data on the basis of descriptive characteristics is called geographical classification.

The method of classifying data with reference to location such as countries, states,cities, districts, etc., is called qualitative classification.

If the lower limit and the upper limit of a class are $10$ and $19$ respectively. Find the mid point of the class?