Statistics Test...

Consider the data  :  $$2, 3, 2, 4, 5, 6, 4, 2, 3, 3, 7, 8, 2, 2.$$ The frequency of 

The mid-point of a class intervals is called:

The formula $$\dfrac{Upper\  class\  limit +  Lower\  class\  limit }{2}$$ is known as

The number of times a particular item occurs in a class interval is called its:

The mean of $$x, y, z$$ is $$y$$, then $$x+z =$$

In the class interval $$35-46$$, the lower limit is _____

The mid-value of $$20-30$$ is _____

A class interval of a data has $$15$$ as the lower limit and $$25$$ as the size then the class mark is :

$$0-10, 10-20, 20-30 ...$$  so on are the classes, the lower boundary of the class $$20-30$$ is _____

Which one of the following groups has different class size from others?