Question

For class 400-500, Find the classmark, class boundaries​

Answer 1

Answer:

(400‚500) - class mark - (400+300)/2

= 700/2

= 350

Answer 2

Answer:

The class mark is 450.

The class boundary of class (400 - 500) is 399.5 - 499.5

Given:

Class mark of the class is 400-500.

To Find:

find the class mark and class boundaries.

Step-by-step explanation:

Class mark:

Mid value of any class is known as the class mark of the class. Class mark in a frequency distribution is the midpoint or the middle value of a given class. It gives the average of any class, in many problems we have to find the mean, or draw graphs so we have to find the class mark.

Formulae for class mark:

The formula to calculate class mark in a frequency distribution is given as (upper limit + lower limit)/2 or (Sum of class boundaries)/2 .

Class mark = (500 + 400)/2

                   =450

class Boundaries:

Class boundary is not the part of the class.  Each class has an upper and a lower class boundary. The class boundary is the middle point of the upper-class limit of one class and the lower class limit of the subsequent class .

Preceding class of (400 - 500) :

300 - 400 ,  so the lower class boundary is

(399 + 400 )/2 = 399.5

Succeeding class of (400 - 500 ):

500 -600 ,  so the upper class boundary is  :

(499+500)/2 = 499.5

Hence the class boundary of class (400 - 500) is 399.5 - 499.5